YouTube always changes and makes problems. We are always doing our best to solve the issues. But sometimes it takes time.
- Please install the latest version at http://tubemate.net
We always recommend using the latest version of TubeMate. - You should check where you installed it from.
There are so many fake and modified TubeMates out there. Of course, they don’t work properly. Some of them even contain virus or spam. Please get an authentic TubeMate at http://tubemate.net. - Please wait for the release of fixed version.
We always try to rapidly keep up with the changes of YouTube. But sometimes it takes time. Please wait for updates for a couple of days or even weeks sometimes. - Please clear local cache.
TubeMate a kind of web browser in Android and old data can make problems. So this simple way could fix your problem.