Just be aware that when first using most features aren't very very friendly user, if you gonna use it make sure you go to the options and make it as intrusive as you need, it can be more intrusive or a bit less, I usually just let the path and choice detected pop up on the top left of the screen but there is even more intrusive features hehe like the watchpanel and watch/monitor variables, just pick a game that you don't mind to experiment with.
After a while is like riding a bicycle, there isn't a single renpy game I don't use URM, even if isn't really needed haha.
The issue you mention happens in almost every game after you load a save and rollback at once, easy to fix, just load the save again

. Never saw this happen after you move ahead into the game but not saying it doesn't happen, just never did with me.
But yes on Artemis there is an issue if you use the gamesaves tab and try to move to an page number with the feature "enter a page number", once you use this and go back to the game, every time you try to go to the game saves page gives an error, only way to fix it is force to enter the URM UI and on the gamesaves tab click on page A Q or 1 and then go back to the game.
First time I got this issue was a bit stuck to undo the mess lmao so I never use the gamesaves tab and advance save pages with it nor save with it on Artemis, it is the only issue I saw this game with URM and the only game I ever had this issue lol.
Actually I posted this issue more than once on this thread

.