The software still shows a miner panel, but it says something like can't get hashrate and "Accepted 0 of 0 results". No crashes being reported, the output just stops being updated. It usually happens on a algorithm switch. The software doesn't start another process.
It seems as though it is confined to the Zergpool Pool at this time. I let it run overnight with Zergpool disabled and didn't have any issues. I enabled Zergpool this morning and right away I had a couple GPUs switch to Zergpool after a few minutes they switched to a different algorithm on Zergpool and stopped mining. I disabled Zergpool again, and all is working fine. So, it seems Zergpool isn't working too well for me.