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Expired signature on Logic 9.1.8 Update: How to fix it?

Hi everyone,

I use Logic 9.1.8 on Mountain Lion and everything always worked well.

But one week ago suddenly it started behaving in a totally crazy way: it changes i/o settings by itself, change some bus routing, ask me if I want ot use mono or stereo send (never asked before), don't play some audio tracks, when I create new tracks some of them, randomly, don't have the switch mono/stereo. And other strange problems never seen before.

Tried to reinstall the upgrade and it tells me sometthing like "this package has an expired signature".

A friend of mine has the same problem.