The refresh button at the top of the dialog just refreshes the camera list, which includes the status of each camera (enabled, paused, recording, triggered, etc). This happens automatically every ~6 seconds anyway so that top refresh button is a bit pointless.
Thumbnails were supposed to reload automatically no more than once every 24 hours. However the automatic reload does appear to be broken!! Thanks for pointing this out. I will see about fixing that for the next UI3 release.
Thumbnails were supposed to reload automatically no more than once every 24 hours. However the automatic reload does appear to be broken!! Thanks for pointing this out. I will see about fixing that for the next UI3 release.