I had the same issues reported by many other users.
Plugins - SEM, Matrix, Solina, Wurlitzer, Vox and the Analog Lab crashed validation one day, having lived and worked on my Mac quite happily for around 6 months.
I tried various things to address, and was told by Arturia to delete, reinstall, check versions - all the usual stuff.
I did eventually have some success, and I can't now remember the exacts steps, butI think it was a combination of clearing audio unit cache files, plus deleting the com.apple.logic10.plist file
Alas I know have to work it out again because last week I upgraded to Logic Pro 10.2 and the problem immediately is back
I recall reading on another thread that Arturia have finally acknowledged there is an issue and are working on a fix. Please hurry up.
If I figure out the resolution that worked before I will post it.