RT at a glance hangs

I wonder if anyone ever experienced the same problem. Sometimes when a
user logs in, RT at a glance page only displays the header and the top
tool bar and then hangs. Sometimes when I cleaned up the cache on the
browser or under Mason data, it worked straight away. I found the
following post in the forum and it did not lead to any conclusion. Any
ideas?

20at%20a%20glance%20hangs;#59738

Tyler Shen