Unable to save description in products with magento -

i got problems when im trying save product short , long description in backend. whenever try change description , press save, text have entered disappears , textarea field blank. not occur long , short description. problem textarea fields in product edit page. can change textarea fields in categories page , on.

i have pdo mysql error debug show you..

sql: select `main_table`.`tax_calculation_rate_id`, `main_table`.`tax_calculation_rule_id`, `main_table`.`customer_tax_class_id`, `main_table`.`product_tax_class_id`, `rule`.`priority`, `rule`.`position`, `rate`.`rate`     `value`, `rate`.`tax_country_id`, `rate`.`tax_region_id`, `rate`.`tax_postcode`, `rate`.`tax_calculation_rate_id`, `rate`.`code`, if(title_table.value null, rate.code, title_table.value) `title`     `tax_calculation` `main_table`  inner join `tax_calculation_rule` `rule` on `rule`.`tax_calculation_rule_id` = main_table.tax_calculation_rule_id  inner join `tax_calculation_rate` `rate` on rate.tax_calculation_rate_id = main_table.tax_calculation_rate_id  left join `tax_calculation_rate_title` `title_table` on rate.tax_calculation_rate_id = title_table.tax_calculation_rate_id , title_table.store_id = '0' (customer_tax_class_id = 3) , (product_tax_class_id in     ('7')) , (rate.tax_country_id = 'se') , (rate.tax_region_id in(0, 0)) , (rate.zip_is_range null) , (rate.tax_postcode null or rate.tax_postcode in('*', '', '', '*')) order `priority` asc,     `tax_calculation_rule_id` asc, `tax_country_id` desc, `tax_region_id` desc, `tax_postcode` desc, `value` desc aff: 1 time: 0.0006 trace: #1 varien_db_adapter_pdo_mysql#0000000002b9780300000000842d8272#->_debugstat(2, 'select `main_tab...', array(), &varien_db_statement_pdo_mysql#0000000002b97a2500000000842d8272#) called @ [lib/varien/db/adapter/pdo/    mysql.php:424] #2 varien_db_adapter_pdo_mysql#0000000002b9780300000000842d8272#->query(&varien_db_select#0000000002b97ac200000000842d8272#, array()) called @ [lib/zend/db/adapter/abstract.php:734] #3 varien_db_adapter_pdo_mysql[zend_db_adapter_abstract]#0000000002b9780300000000842d8272#->fetchall(&varien_db_select#0000000002b97ac200000000842d8272#) called @ [app/code/core/mage/tax/model/resource/calculation.    php:341] #4 mage_tax_model_resource_calculation#0000000002b97ab100000000842d8272#->_getrates(&varien_object#0000000002b97a8900000000842d8272#) called @ [app/code/core/mage/tax/model/resource/calculation.php:99] #5 mage_tax_model_resource_calculation#0000000002b97ab100000000842d8272#->getrateinfo(&varien_object#0000000002b97a8900000000842d8272#) called @ [app/code/core/mage/tax/model/calculation.php:193] #6 mage_tax_model_calculation#0000000002b97a8a00000000842d8272#->getrate(&varien_object#0000000002b97a8900000000842d8272#) called @ [app/code/core/mage/tax/model/calculation.php:412] #7 mage_tax_model_calculation#0000000002b97a8a00000000842d8272#->_getrates(&varien_object#0000000002b97a8900000000842d8272#, 'product_class_id', 'product') called @ [app/code/core/mage/tax/model/calculation.php:420] #8 mage_tax_model_calculation#0000000002b97a8a00000000842d8272#->getratesforallproducttaxclasses(&varien_object#0000000002b97a8900000000842d8272#) called @ [app/code/core/mage/tax/helper/data.php:392] #9 et_currencymanager_helper_tax[mage_tax_helper_data]#0000000002b97b3000000000842d8272#->_getallratesbyproductclass(&et_currencymanager_model_store#0000000002b9782300000000842d8272#) called @ [app/code/core/mage/tax/    helper/data.php:376] #10 et_currencymanager_helper_tax[mage_tax_helper_data]#0000000002b97b3000000000842d8272#->getallratesbyproductclass(&et_currencymanager_model_store#0000000002b9782300000000842d8272#) called @ [app/design/adminhtml/    default/default/template/catalog/product/js.phtml:45] #11 include('/var/www/vb1/app...') called @ [app/code/core/mage/core/block/template.php:241] #12 mage_adminhtml_block_catalog_product_edit_js[mage_core_block_template]#0000000002b97a6c00000000842d8272#->fetchview('adminhtml/defaul...') called @ [app/code/core/mage/core/block/template.php:272] #13 mage_adminhtml_block_catalog_product_edit_js[mage_core_block_template]#0000000002b97a6c00000000842d8272#->renderview() called @ [app/code/core/mage/core/block/template.php:286] #14 mage_adminhtml_block_catalog_product_edit_js[mage_core_block_template]#0000000002b97a6c00000000842d8272#->_tohtml() called @ [app/code/core/mage/adminhtml/block/template.php:81] #15 mage_adminhtml_block_catalog_product_edit_js[mage_adminhtml_block_template]#0000000002b97a6c00000000842d8272#->_tohtml() called @ [app/code/core/mage/core/block/abstract.php:863] #16 mage_adminhtml_block_catalog_product_edit_js[mage_core_block_abstract]#0000000002b97a6c00000000842d8272#->tohtml() called @ [app/code/core/mage/core/block/text/list.php:43] #17 mage_core_block_text_list#0000000002b97b0000000000842d8272#->_tohtml() called @ [app/code/core/mage/core/block/abstract.php:863] #18 mage_core_block_text_list[mage_core_block_abstract]#0000000002b97b0000000000842d8272#->tohtml() called @ [app/code/core/mage/core/block/abstract.php:582] #19 mage_adminhtml_block_page[mage_core_block_abstract]#0000000002b97b3b00000000842d8272#->_getchildhtml('js', true) called @ [app/code/core/mage/core/block/abstract.php:526] #20 mage_adminhtml_block_page[mage_core_block_abstract]#0000000002b97b3b00000000842d8272#->getchildhtml('js') called @ [app/design/adminhtml/default/default/template/page.phtml:82] #21 include('/var/www/vb1/app...') called @ [app/code/core/mage/core/block/template.php:241] #22 mage_adminhtml_block_page[mage_core_block_template]#0000000002b97b3b00000000842d8272#->fetchview('adminhtml/defaul...') called @ [app/code/core/mage/core/block/template.php:272] #23 mage_adminhtml_block_page[mage_core_block_template]#0000000002b97b3b00000000842d8272#->renderview() called @ [app/code/core/mage/core/block/template.php:286] #24 mage_adminhtml_block_page[mage_core_block_template]#0000000002b97b3b00000000842d8272#->_tohtml() called @ [app/code/core/mage/adminhtml/block/template.php:81] #25 mage_adminhtml_block_page[mage_adminhtml_block_template]#0000000002b97b3b00000000842d8272#->_tohtml() called @ [app/code/core/mage/core/block/abstract.php:863] #26 mage_adminhtml_block_page[mage_core_block_abstract]#0000000002b97b3b00000000842d8272#->tohtml() called @ [app/code/core/mage/core/model/layout.php:555] #27 mage_core_model_layout#0000000002b9783e00000000842d8272#->getoutput() called @ [app/code/core/mage/core/controller/varien/action.php:390] #28 mage_adminhtml_catalog_productcontroller[mage_core_controller_varien_action]#0000000002b978af00000000842d8272#->renderlayout() called @ [app/code/core/mage/adminhtml/controllers/catalog/productcontroller.php:269] #29 mage_adminhtml_catalog_productcontroller#0000000002b978af00000000842d8272#->editaction() called @ [app/code/core/mage/core/controller/varien/action.php:419] #30 mage_adminhtml_catalog_productcontroller[mage_core_controller_varien_action]#0000000002b978af00000000842d8272#->dispatch('edit') called @ [app/code/core/mage/core/controller/varien/router/standard.php:250] #31 mage_core_controller_varien_router_admin[mage_core_controller_varien_router_standard]#0000000002b9785400000000842d8272#->match(&mage_core_controller_request_http#0000000002b9782000000000842d8272#) called @ [app/code/    core/mage/core/controller/varien/front.php:176] #32 mage_core_controller_varien_front#0000000002b9784a00000000842d8272#->dispatch() called @ [app/code/core/mage/core/model/app.php:354] #33 mage_core_model_app#0000000002b9781400000000842d8272#->run(array('scope_code' => '', 'scope_type' => 'store', 'options' => array())) called @ [app/mage.php:683] #34 mage::run('', 'store') called @ [index.php:87] 

update: problem started when changed fck editor tinymce editor. have tried reinstall fck , mce , no luck there.

first disable extensions make sure thats not problem. is. , disable system>config>advanced.

if doesnt change anything, check tax rules, rates , classes in sales>tax. remove them may have delete, , created rule , maybe conflict.

also, did make custom attributes related tax or anything?

one last thing, based on update. go system>configuration>content management> , disable wysiwyg editor.try update , save then.

good luck