LyX 1.3.0 xforms on Linux. Open Preferences>Lang Opts>Language. Change Default language to, say, Croatian. Save and Appy buttons are still disabled, but Close is changed to Cancel. Select some other tab, say Inputs>Misc, change Date format, save and close. Open Preferences>Lang Opts>Language again. Default language is correctly set to Croatian, meaning that the changed option is saved, although not from that tab, but from some other.
Either I don't use it correctly or it's a bug. -- [EMAIL PROTECTED]