But, I just tested it (in 13) on some SD (720 x 576) footage, a transfer from VHS, and it worked fine! I chose an especially "bad" section - lots of noise and picture disturbance - and it cleaned it very well.
NeatVideo works fine in VPX 13 up to 1920x 1080 project settings - even when working with 4K UHD video on timeline, just does not like higher resolution projects.
Will do some more checking as I did buy the full version to work with 4K.
I reported the issue to NeatVideo earlier and have received some feedback a few minutes ago:
'The message indicates that the host application (Video Pro X 13) has provided one of the input frames of the wrong size: 0 x 0 pixels instead of expected 1920 x 1080 pixels . . . . The problem is on the side of the host application. Perhaps it has difficulties decoding that frame from the source clip. Or there may be a shortage of memory for the frame. . . .
Will have to see how this one goes - for now it is working correctly.