I have a couple of issues - the first that I can explain is that when I have a full screen rdp session running to another machine and have firefox running in full screen on the original computer I often find that it stops responding to mouse clicks. Scrolling tends to stop working completely and today I was unable to click anywhere or put the cursor in the address bar until I changed the size of the RDP session to not be maximised.
Once the size was a portion of the screen I could use firefox with no issues.
As soon as I stopped Display fusion the problem went away.

The other issue I have that I've not been able to reproduce reliably is that occasionally I'll maximize a window and I'll see it maximize but I don't see it on any monitor. I can alt-tab to the app but it does not show up.
Are either of these two known issues? I'm running 7.2.0 beta 3

(I've also had issues with computer running slowly as others have mentioned. I have 3 monitors with 2 of them split with a vertical split around 100px wide on the right with taskbars running on the three big screens and hidden on the 2 small ones.

It's probably about every 2 days or so? It's running fine at the moment for example (typical!)

If there are any debug logs I can send or turn on when it occurs, then let me know.