Hi Jontie. This indeed sounds frustrating but also puzzling since the evaluation versions and the "paid for"version are identical. In fact the only difference AFAIK is that you enter a serial number to remove the "nag" screen. I think therefore that it's not REAPER directly causing the problem.
Can you say what exactly has changed eg are old projects all distorting or just new ones? Does it affect all tracks? Is it obvious when monitoring tracks when in record?
Have you checked all the settings in the Audio Device section in Preferences? I notice you are using the MAC's output and that the OS had recently changed. I am not a MAC expert but I would check here for a mismatch (perhaps sample rate?) Also is the Audiobox driver compatible with your system upgrade? I know Audacity runs fine but might be worth checking.
As you can tell I have no definitive answer - just suggestions to try till the real experts show up!
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