I found another thing (not sure if it still applies, as I'm a bit behind on the versions). The pause-restart thing works great for some things if memory use goes too high, but if you're doing anything with motion blur (where it renders extra for over-sampling) you'll get it stuck rendering the same frame in an infinite loop the next time you restart it. Oddball annoying bug, to say the least.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.