That's weird, especially if the "Give Exp" panel is still there, since it's commented out in the latest version. Maybe it's an old version of the cheat menu still sitting around somewhere causing conflicts?
I'd try cleaning up first. Delete the Cheat_Menu.js and Cheat_Menu.css files from the \www\mods folder, and also delete them from the \www\js\plugins folder if they're there (that's the old location). Then delete this line
JavaScript:
{"name":"Cheat_Menu","status":true,"description":"","parameters":{}},
from the mods.txt, and also maybe check the www\js\plugins.js file if the line is still in there (for the old version) and remove it there, too.
Alternatively, just redownload the game fresh and carry over your save folder for a clean start.
Start the game without the cheat menu, see if it works properly, then close it and try to re-install the mod again.
Put the Cheat_Menu.js and Cheat_Menu.css files from v6 into www\mods\ and add the line mentioned above into your mods.txt again.
Hope it works out for you!