When you try to edit content in another language, the content does not open and the following error occurs: Culture is not supported . Y ou may also get an error in Windows Event Viewer similar to: error: culture is not supported. Parameter name: culture XXXXXXX (0x100002) is an invalid culture identifier. (XXXXXXX is a seven digit number)
If you enabled a language that was among the standard set of supported languages, and tried to edit content in that language, you sometimes saw the error
Culture is not supported
Install 9.00 SP2 CU33 or later.