So, I'm now eligible to send PMs to my partners, as I've already done for one. However, these past few days, I've been unable to send another one of my partners something like a simple 'hello' or 'would you like to continue brainstorming', etc. When I send the message, the huge message pops up saying it was sent but when it shows up on the actual message, the conversation is locked and my partner is suddenly locked out of the PM when they're not online. I didn't check, never checked off the 'lock conversation' status. Explanation?