I posted this on the "Forum Help" Forum by mistake (forgive me, I'm new to this) so I'm reposting it here.
I'm using Digital Perfromer 2.72. It had worked perefectly for me for 2 years. No problems. Then, I changed my operating system from OS9 to OS9.2. Now it freezes up so badly I can't use it at all. I've tried everything MOTU has suggested. Interestingly, sometimes (not always) it creates a huge (2 GB) Sounddesigner II file (even if I'm not recording). The file is a crazy mix of audio from all kinds of differetnt DP projects, some of them slowed way down, some at normal speed, white noise, clicks. It's weird! What do you think is going on.
Thanks,
Sam

I don't know what to tell you but you should upgrade to 3.1.1 version.
Although you can't double clicks to open the project anymore.
I think it has to do with OS 9.2.2. Other than that it's more solid and stable than 2.7.
The big plus is you'll have an unlimited undos.

Thanks azusa. If I upgrade I'm thinking I might as well move up to DP4 and OSX, as tunetwister suggest. Any reason not to in your opinion?
Thanks,
Sam