3rd Party Assets Missing After Reset

Hoping someone can help. After having to reset my PC and re-downloading TS20xx, I re-installed my 3rd party assets using the Utilities.exe. However only a handful of these are showing up on the Object Set Filter list. I have checked my Railworks Assets folder and ALL of the assets are listed there, just not when I get into route building mode in the Object Set Filter.
Distinct possibility that I'm just doing something wrong, but grateful for any help on fixing this.

 

Clear the game's cache then report back, give an example of an asset pack that's not showing.

 

Thanks Torfmeister. I've cleared the cache a number of times to no avail. The list of unavailable assets is quite long, and admittedly some are quite old, downloaded from various sites but if they worked fine a few days ago I don't understand why they're not working now. Not sure how best to give an example.

 

Solved! Two steammapp files - game only reading one of them. Got it sorted now!

 

Glad you solved that - stuff like this wouldn't have been figured out here. (Except in a TeamViewer session)