Nero Recode 12 hangs after Windows 8.1 upgrade

I've run Nero Recode 12 on my laptop for the better part of a year with no trouble. Since 8.1 update, when I try to convert a dvd file tree from my hard drive to .mp4, Recode hangs. The clock for conversion starts counting down and then the entire program freezes. Tried to check with old directories previously converted successfully and same problem. Anyone else have this complaint?
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