Issues after Reason upgrade...

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I haven't opened Reason 10 in the last few weeks after the last upgrade. I have a MAC and when I tried to launch from the tool bar I got an error. Whren I went into applications it opened but it was like it was for the first time. More oddly all the Reason songs I had saved on my desktop only open now as text files. All very odd. Any ideas?

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I see what the problem was-I was running off my old Reason 4 program. I've had to download 10 again. Admin feel free to delete.