Fatal error: Cannot use object of type xthreads_db_binary_value as array in...

[ZiNgA BuRgA]

Max filename length is set to 120 characters.  If you need more, you can change the width of the filename column in the xtattachments table.
MyBB sets the filename length to 120 characters in its attachments table, but I suppose there's no reason to follow that - I'll probably increase it to 255 characters.

Thanks for reporting.