For some reason my gallery and cacheclip location were changed to an external drive I no longer use, so I always have to manually re enter the location for each project.. how can I make this permanent?
Go to the Resolve top menu
DaVinci Resolve -> Preferences -> Media Storage
The first drive listed is chosen as the cache drive by default. Remove the drive that you no longer use and make the first drive as the one you want to use for cache.