Although the ratings limits of many open invites indicate I can accept a game, suddenly I'm not able to accept any of these games. Is these a glitch in the system on this?

@AttilaTheHorn

Can you provide an example - the rating bands on the open invite, and your current rating at the time you experienced the problem?

I think I've found the problem. It's because I'm currently playing my maximum of 12 games as a non-subscriber. I think this may be why I'm blocked from accepting an open invite.