Campaign doesn't seem to refresh all the time.

The group I have been playing with is having this problem where sometimes the DM will clear the board of drawings or try to bring a new map in but it will only show what was there before hand to everyone but him. The DM will see everything he is doing but it isn't updating or refreshing properly for everyone else, we are new to this site and maybe it's something we are missing but I think it may be a bug of some sort. If anyone knows about the problem I'm talking about and has a fix of any sort that would be GREATLY appreciated.

Also refreshing the page doesn't work, it will still display what had been erased already by the DM.

I experienced a bit of this myself lately, I had to reload several times to get the players to see what was there, and erased drawings showed back up a few times.

Perhaps, it did it 2 days in a row while we were messing about on here trying to do a campaign and figure out all the features and functions.