An aside regarding Chrome & Flash, with a possible explanation about why it crashes sometimes and not others:
I've been mucking with a number of different Flash programs over the past days in Chrome (TokBox, Pyromancer's dungeon builder) and for weeks on sites that use Flash integration (gMail, gDocs, Facebook chat, etc), and I think there may be a memory leak in Chrome's integration of Flash at the moment. Gradually as I use Flash, it gets less and less responsive, and Chrome starts offering to kill the process because its hanging. Then if I wait and keep it alive, it'll come back. Each time slower than the last. This is true on my Home PC (Win 7/Chrome Beta, current), my Laptop (Vista/Chrome, current), and my Office PC (Win 7/Chrome Canary developers build, current). This was such a problem with video that I switched my YouTube account over to HTML5 and suddenly the videos there loaded perfectly in all three Chrome variants.
So it's pretty universal across all three of them. I haven't, on the other hand, noticed a problem with it on my Ubuntu boxes, whereas the Win computers have had this issue for weeks. I'll take a few hours to log in and start working in Roll20 from Ubuntu, and see if I can reproduce the hang-ups from there.