Got exactly the same this morning and I closed MWB and did delete that database file - no change!
I have had version 3 installed until a couple of days ago as it was impairing my web-browsing too much, then after a LONG time I decided to test it again and I got a problem on one computer and today this on another [PAID versions!].
Are you going to fix it or shall I find another Company?
MWB is NOT any more what it used to be, especially on mobiles ... overcharging!
Is it the end of MWB ?
What shall I do to be able to use Seamonkey? I use 3 browser for different things and cannot