Simulation halts in Firefox on Three Month update step

[lyndings]

When run in Firefox 11, the simulation will stop after being switched to the Three Month update step. Lower update steps appear to work without issue.

Switching to another tab and back causes the simulation to resume for about a second (worker is sent "pause" and "resume" commands) before halting again. Lowering time step when the simulation has halted, then switching to another tab and back will resume simulation at the new time step.

[lyndings]

The switch to the new Days Per Second slider from the Update Step drop-down has revealed that this issue crops up when Days Per Second approaches 50 - values lower than this work without issue.