Hi,
I was testing with different format strings for the Tag->Filename conversion. The program started behaving unexpectedly when the string was getting rather long - I could type more characters, but every keypress took me to the beginning of the string in addition to adding the character I wanted.
In my string this happened with exactly 261 characters, but with a continuous character string without white space or special characters the limit was at 255.
I'm using version 2.37j.