Hit Control and F5 at the same time to force a full refresh. This is caused by a file that is stuck and needs to be reloaded from the server.
Aaron Z
I have had it happen from time to time on many sites. Just some file that got stuck between your computer and the server.I fixed it with a refresh but why? I've never had to do that anywhere else.
Same here.It only does it with this site for me. It started some weeks ago, when they were having other server issues. It happens much less often now, but still occasionally.