Your topic name and description is very vague. Please specify the exact problems you are having with the third party
ProTube app. I'm also using it. I do know that it still sometimes had a delay in showing the video when you pressed the play button for a certain video but I haven't seen that since the recent update. Also in some cases you have to press after clicking the video 'Try another player' or something to start the video. I do know the developer recently updated his app but that it was a workaround because Google YouTube didn't update their API as they should have been doing if I understood the developer correctly. I can play videos though with the app.
26th of July update:
"
What's New in Version 2.5.9
This update introduces a workaround for a bug in the YouTube API that causes subscriptions, what to watch and playlists to fail loading.
The bug that causes these errors is not in ProTube, it is a bug in the YouTube API. It is a critical bug, yet YouTube has not fixed it or made any statement even after several days. Therefore I was forced to introduce a workaround in ProTube in order to make the app work properly again."