After Mountain Lion, iMac goes to sleep even while Quicktime is converting files

Hello!
After Mountian Lion, I have had to change my Energy setting to NEVER put the computer to sleep. iMac has been going to sleep even while it is converting files. This never happened with the previous OSX.
Does anyone know why it goes to sleep even when tasks are being performed? It's very annoying.
Thanks!

Same problem here on a Mid 2007 Core 2 Duo -- set to "never" but keeps dozing off.
Extra lousy since it's also the print and media server.

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