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Up to a couple of hours I was able to see my lyx file in PDF format, but it mysteriously stopped working. If I attempt DVI or PS, it's as if I haven't clicked the buttons.

Are there perhaps some processes hanging? Any help would be appreciated.

Thanks

I have Lyx 1.5.6 on Vista. I've installed all packages and all classes as far as I know. However, I still see a lot of classes unavailable in the "Document ==> Settings ==> Doc. class" settings.

I have reconfigured Lyx a million times, I've changed the Path in Lyx, I have pretty much followed the ...