I had a problem when I added FDM to my winapp2.ini (not previously) and solved it by removing downloads.del.sav, schedules.sav, mctasks.sav and *.bak from the .ini list.
Having all the favicons disappear was a bit of a surprise that I could have done without. It's easy enough to exclude the folder, but it's possible to delete those from within Opera itself and I wouldn't call that an "improvement" to the history cleaning.