dotcomUNDERGROUND With task=create_cache all it will only create thumbs for new files? Or re-generate cache for all?
It will only generate cache for items that are not cached. Also, this task is not only for thumbs, but also for the JSON folders cache (used when navigating pages).
You can use the force
parameter to re-create and overwrite existing cache, even for cache that is valid. If you just want to just remove cache items, you can remove files from the dirs inside _files/cache/*
manually.