I've had a couple of crashes using the experimental renderer. I'm reporting them here since bug reporting doesn't work in Firefox 3.6. The first error occurred Thursday (6/23) on transition between two streets. It displayed a white screen with a single large exclamation point in the middle (never seen this before). I had to log out and do a complete reload to get the game back.
The second error occurred Friday (6/24) on initial load of the game - it gave the following error messages:
[UncaughtErrorEvent type="uncaughtError" bubbles=true cancelable=true eventPhase=2]
[SecurityErrorEvent type="securityError" bubbles=false cancelable=false eventPhase=2 text="Error #2048: Security sandbox violation: beta.glitch.com/swf/DEBUGBo... cannot load data from api.glitch.com/simple/clien...;]
This second error looks more like a server error than something the renderer would cause. System is Firefox 3.6/Flash 10.3.181.22(debug version)/WinXP