I just had a spelling check problem after I installed Thunderbird V24.0
It no longer worked correctly.
checked the Mozilla bugs list and found this gem:
Just in case anyone's confused, the full 'path' is: *Tools* > Options >
Advanced, and click 'Config Editor' on the General tab. Search for
mail.compose.max_recycled_windows, double click it, and change the '1' to '0' in
the 'Enter integer value' window that pops up.
It's working for me with TB 24.0 in Windows 7 (Pro)-64 bit.
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