I've only experienced this once, but I figured it is worth reporting in case other people are experiencing it, too. So I went to my WL about an hour ago and my default category "Unsorted" was completely missing. it was genuinely not there. I even did a control+f search for it, because I have quite a few categories. I reloaded my wl about 30 minutes later and voila! It reappeared. I use Firefox 51.0.1 (32-bit).

Edit: 10/13/17- It just happened again. I changed my default category from "Unsorted" to "Current Event Items" and both categories have vanished, along with several others. I have a screenshot of it if anybody ever responds to this thread. They reappeared several minutes later. When I changed my default category again, the same thing happened and even more of them vanished.

The last time I noticed it was mid-December. I'll keep an eye on my wl as I clean it up post-Luminaire and I'll let you know if it happens again.

Got this thing today as well...

This was the previous topic about it. I still get the problem occasionally, but just manually enter the url for my unsorted category, and then it comes back.

This just happened again. I guess it is not fixed yet.

- I haven't experienced any problems. Can't speak for other users who have posted though.

Thanks I will leave it open for a bit just in case then!

I haven't experienced this in a long time either.

Ok! Locking as resolved.