For all of you. This may not be te problem but in the past, YouTube has altered their sign in requirements and Power DVD could not be used to sign in. Cyberlink came in with a patch to fix it shortly later.
Since there are many of you that have the same problem, has anyone contacted Cyberlink about it directly?
Note, I'm signed in permanently so I can't help further.
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BoilerPlate: To posters who ask for help -- it is nice to thank the volunteers who try to answer your questions !
Anything I post unless stated with a reference is my personal opinion.