Maybe it's related to something IG, but yesterday one of my characters could not make any sendings. I could hear them fine, and other PC's did it right in front of me. But when I tried, I got a "Oh no,no,no. You're not allowed to make a sending."

Any idea what happened?

A Law Enforcer likely removed your sending privileges. Have you been in trouble with the law lately?

Haven't assaulted anyone recently, no. If I've done something wrong, I have no idea.

Sounds like your sending privileges were removed by an authorized PC. This isn't a bug.