Unable to use software instruments in LP9...please help??

I am having trouble opening software instruments in lp9. They worked fine about a week ago. Now, all of a sudden, they don't. I can play my keyboard and record it fine, but if I insert a software instrument, it the signal doesn't register in lp9. Also, shouldn't there be an input select for my software instrument?...because there isn't. I am using leopard and I have a presonus firestudio interface.
Thanks in advance!

3rd party pluggs or Logic instruments? Did you change hardware or installed/updated your software? I have a similar problem after an update where logic can't open 3rd party pluggs... But then I can open them on new projects... Strange!.....

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