I'm running LR Classic on Win10 with plenty of memory and disk space and a decent i7.
I've created a smallish slideshow (88 files, mix of jpg and raw). It previews OK, but when I export it to 1080p video, the background task just hangs. Judging by the progress bar, it may make it through a few frames, but nothing ever comes out, even if I leave it for a few hours. No music or other fancy stuff.
Sorry to hear you are having trouble. Let's perform a test on your system and see if we can zero in on the problem.. If you grab just 10 files and attempt the same (instead of the full 88 files), will the slide show then execute?
It seems to be random, or dependent on some unknown system process. When I originally built the show, it had 86 stills and exported OK. Then I added a video clip in the middle, and it started hanging at that point (judging by the progress bar). I removed the video, and changed a couple of the still images, and after that nothing worked. I did try a smaller subset at the time.
Strangely, I just went and tried it, and it seems to be working again. Nothing has changed, other than rebooting the computer at some point in the interim (which I had also tried before).
So it now works with the video inserted in the middle?
It works with the full set of stills - I didn't try reinserting the video. I discovered the limitation, that you can't mute the background music during video clips, so I'm assembling the stills into a silent video and then finishing the edits in Lightworks.
I can test reinserting the video later.
Reinserting the video now works too. Go figure.
Resetting preferences is definitely a bummer. It nukes LR in all sorts of subtle ways you've forgotten you set up.