Bug fixed! I have just released the update to the DSLR_RAW module that I forgot to release yesterday. Things that happen when one is working too much and too late (and getting older, too...). Sorry for the trouble.
The problem was that the DSLR_RAW module does not support concurrent accesses, mainly because it uses some static data that is rewritten each time a new file is loaded from disk. The update simply synchronizes file accesses from modules to prevent concurrency. The new versions of StarAlignment and ImageIntegration implement high-level parallel I/O for the first time in PixInsight, which has exposed this issue.
Let me know if you encounter further problems, I hope not.
Mike, of course if you upload raw data for testing, that will be of great help for me. Fresh testing data always helps. Thank you!