2017-04-07, 12:04
My understanding (which may not be 100% correct so anyone please correct me if I'm wrong) is that the image cache is updated every so often although I'm not sure of the frequency. The only way I have found to force this in the past involved tracking down the image in the cache and deleting it which also involved looking at the database to find the reference to the specific cached image. I guess you could just delete all the cached images if you have a lot of changes although it's not something that I've tried.
