Ok.. Our members want to be SURE that their high scores will remain.
I asked them and they said they want to stick with 2.5.5+ and bugs rather than 2.5.6+ with bug fixes and slight chance of losing high scores.
That means I can't upgrade to 2.5.6+ unless you can assure me nothing will go wrong.

I made a backup of my database but there was some Arcade file thing in the error log, so Im' not sure if I can count on that.
Is it possible to copy those arcade files from FTP (Arcade folder and arcade.php) and upload them back if something goes wrong and it would be working again, with the high scores?