Re: Invention Glitch

@ManeEvent4U  I've never heard of the inventing skill or workbench being stuck in quite that manner.  Are you sure your sim hasn't already invented everything available?  It might be that the game rolls the "invent" scenario but then can't find anything new.  (This shouldn't happen either, of course.)  If you want to check, here's a list (scroll down); keep in mind that the air bender and claw dipper need to be installed from the Sims 3 Store.

https://www.carls-sims-3-guide.com/skills/ambitions/inventing/

At any rate, the simplest approach would be to delete and replace the workbench.  It's a good idea to delete the five cache files in your Sims 3 game folder in Documents\Electronic Arts as well; while troubleshooting, do this every time you quit the game.  For reference, they are:

• CASPartCache.package
• compositorCache.package
• scriptCache.package
• simCompositorCache.package
• socialCache.package

If replacing the workbench doesn't help, try evicting your sim (from Edit Town) and moving him back in.  This will allow him to keep his job and relationships, but it will erase his promised wishes and opportunities.  So complete anything you don't want to lose first.  Once he's back in his house, use "save as" to rename the save (so you have a backup if you need it), quit, delete the cache files again, reload, and test.

If that doesn't help either, go to Edit Town and evict your sim again, save his house to the bin, bullldoze the lot, replace the house, and move him back in.  This is a bit more thorough than just evicting and replacing a sim.  Again, be sure to save as, quit, delete the cache files, and reload before testing.