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PS. Never mind, now it works. Thank you again!

Thanks for your reply. I did what you described, and it was going fine for a while, but then I got a window with the following message:

The system reconfiguration has failed. Default textclass is used but LyX may not be able to work properly. Please reconfigure again if needed.

Reconfiguring ...

Hi, I've been using LyX for a while on my Windows PC, and have become a huge advocate.

But after recently having to reinstall Windows and then LyX/MikTeX due to various problems, something seems to be wrong with my settings:

- At first, whenever I would open a document, I'd get a message saying ...