I believe that this happens when you do not have right access to the directory where the assembly or part is coming from.
I got several quick answers that were right on. Well, at least they led me to the answer. I have opened the assembly from a write protected folder (which was set as my working directory) and then backed it up to another, non-protected folder. I had changed my working directory to the new folder prior to backing up, but I guess Pro/E was still trying to write the temp file to the original folder. I closed pro/E and restarted and the problem is fixed. Thanks,
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