I've had another customer report this specific error but they were still using TandemVids version 2011.1.12.0.
Google deprecated the authorisation code and YouTube servers TandemVids was originally using to upload videos. It looks like they've finally flicked the switch and broken all legacy code. I imagine many applications around the world are suffering the same issue. Fortunately I was pre-warned and rewrote the YouTube upload application last year. If your version is less than 2014, please download and install the latest version from
the download area .
Install straight over the top. All your customers, templates and settings will be fine. You may need to restart any YouTube uploads. In the newer versions, you can select multiple customers from the Search tab and right click to choose queue for YouTube.
A new release is due out in a few days to address a few issues with the current build. These are documented
here .
Mick