I get this all the time. It used to fix when my Sim slept, it would be gone when they woke up in the morning. But now it is still there. I can only exit the game and come back in to get rid of it now. Even learning something else does not get rid of it.
Also, after I talk to another Sim the social box at the top stays long after the Sim leaves. I can see all their mood changes. Again, only leaving the game seems to fix this.
Visit me in the gallery! CC-free builds under origin name Piperbird!
Sometimes the skill itself will get stuck, and the bar will continue to progress beyond 100% without the skill advancing(I've seen it reach almost 300%). Usually dropping into manage worlds and reloading will fix these glitches, but eventually they will rubber-band back to their true position even if you do nothing. Clearing the cache seem to help with most of the "stuck skill" issues. For what it is worth, these seem to be graphical/ labeling issues that don't effect gameplay at all.
2019 and having the problem. Strange with all of the updates that it hasn't been fixed yet. Reset sim did not work. But restarting the game did work. Still, after all this time and all those updates, you'd think it would be fixed by EA. Kind of breaks the game moment to have to restart the game.
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Also, after I talk to another Sim the social box at the top stays long after the Sim leaves. I can see all their mood changes. Again, only leaving the game seems to fix this.
Try traveling to another lot and see if that helps the issue.
http://forums.thesims.com/en_US/discussion/817478/hello-come-and-introduce-yourself
http://tinyurl.com/OneRoomOneWeek
http://tinyurl.com/rosemow
My Showcase thread https://forums.thesims.com/en_US/discussion/948861/rosemow-s-rooms-showcase