Sorry, I whish it would be that easy, but Category cache was in ACP at Global Options allways turned off.
Time for caching Index Data "0" and "Use photo viewing cache" also "No".
If I upload a new Photo the Category Thumb is automaticly set to this latest Photo. That`s fine.
What doesn`t work at all is:
- "Make Index Thumb" at viewing a Photo doesn`t change anything.
- Changing Thumbnail IDs in Database pp_categories doesn`t change anything (very confusing).
- As I recognized now: All Sort Functions at viewing a Category are working no more (Check for example here).