Strange problem with Extras menu

Mattebass's icon

Hello
I just had some bad days with the OSX 10.8...
I've now discovered another issue, max 6.1.3 and also 6.0.8, had begun to show in the extra menu some extras located in max 5 folder.
Same thing with my other mac running osx 10.6...
How it is possible?

any cues?

thanks

Matteo