Colin,
WGT is having issues with part of the last update. One of the things effected are the invites and acceptance process. I'm sure that people are sending invites, but chances are it will take a few trys to get one in your mailbox.
As for the fix? WGT is supposed to have this issue resolved during the next update. I for one as an owner of a club have stopped sending out invites. It seems as if 1 in 10 receive the invite. If you have not joined a club by the time the next update is completed, I will get an invite to you as soon as possible.
Good day,
Yokosaki
Masters Golf Association
www.mga-wgt.com