First off, my setup (this is currently happening on my laptop, but some happened on my desktop, i'll denote which of course)
Windows 7
4 gigs of RAM
1.6 Quad core machine
Chrome 21.0.1180.60 (and Firefox 14.0.1)
Flash Version 11.3.31
I have a few issues, the first being one of the more annoying.
Several times when I either log into Roll20 i'll be stuck in a infinite loading screen. This also occurs when ever I try to switch from one map to another.
I've also noticed when I type a long text message oddly enough it looks like the map will shift itself into the chat box and the area where the map should be is white. Though moving the mouse over where the map should be does fix this but it occurs fairly often when making long messages (not even as long as this paragraph).
To try and resolve the issues I tried installing Firefox today and ever since i've had a new problem. Now when ever I load up Roll20 (at least on my laptop) it's assuming i'm always trying to highlight, or clicking and dragging even when i've pressed no mouse buttons. I have noticed when that happens the grid and map refuses to show up.