I have noticed that my pies expired, but I still have access to this section of the forum. I guess this is not the excepted behavior? It looks like the access isn't revoked when user gets pies expired.
Let me know if I can help with testing of possible fix. I was about to buy a new pie, but I can wait if that would help to check if the issue is fixed.
The pie from you has expiration set to 4th April. I guess it got reset to a full month after the transfer.
Are you using the old forum skin? I found that sending pies on the old skin doesn't work. I had to switch to the new skin to be able to send a pie for a post owner.