Maschine + SD card: installed factory expansion and other user expansions disappeared

I've purchased Maschine + about one month ago.

I've installed all the expansions shown as avaliable in the library an I've also installed, connecting Maschine + to my Mac Book Pro, some expansions from NIKE Audio and Mad Zacks that I use with Maschine MK3 and my laptop (yes I've they both....).

All the expansions installed worked fine. Then I turned off Maschine +. When, after a couple of weeks, I've turned on again Maschine +, even after doing the rescan process, all the expansions installed disappeared !

The factory expansions don't appear in the browsing but are avaliable and installable (again...) while the user expansions don't appear in the browsing.

What can I do ?

Is my SD card (the original SD card that comes with Maschine +), corrupted ?

Thanks

Angelo