Since quite a while it struggles to follow up all the changes made on YouTube (which surely are made to inhibit software like VDH...) and currently it again does not download any YouTube video. Unfortunately there seems to be no really "universal" solution visible to circumvent all these blocking attempts...
Interestingly this doesn't seem to influence many other websites,...
It surely would help to easify the contact for such new YT-problems and... as you always complain about unusable postings about failures... why do you not simply let VDH make a small text file containing all the date you need in a tabular 'shape'...? This would make it even easy for those without much knowledge of bug mailing...
All you additionally need is usually ar best the exact version of OS... and if there's more you need: Make a "how to post failures" on your support forum and keep it simple and clearly arranged...
I will change my rating according to VDH's status