I am having the exact same issue. Similar to the others, I signed up originally in 2009, but never played. After resetting my password, I was able to start-up WGT on my desktop, however, I am having the exact same issue as OP and person who posted the screenshots.
Strangely, I can play on my tablet -- I was able login and played a couple of head-to-head challenges.
Any suggestions on what I can try to be able to play on my desktop?
Thanks