QB-Customs usable for all

To start I am having issues with QB-Customs. Everytime I open the location my mouse gets stuck on the screen and it is unusable. I would also like to make it so you dont have to be a mechanic to customize your vehicle; the goal is to have it where you can paint you car and adjust cosmetics but to tune/upgrade your engine and all you have to go to the player owned shops.

Any ideas?

Also; when the mouse is stuck on the screen it is the original script with no changes.