You won't get the fillet option in the pet palette with two lines like this.
But the tool still works.
If this dialogue is not showing, is it because you were working on 2 screens before and it is now not on the main screen so you can't see it?
You say it was working yesterday but not today.
I am wondering if you have swapped machines or from 2 screens to one?
If that is the case, maybe try re-applying the standard work environment to see if that resets it.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10