Is there something up with that? I click the send button.
Maybe you clicked too slowly. Have you considered that?
it sits in your outbox until the recipient opens it, I believe.
but they can see who it is from 
Yes, you believe right. 
If you’ve been clicking your send button a lot, I’m beginning to suspect why they might be slow to read it..
You didn’t specify if this is this every private message you send, or just maybe one or so. Naturally I’m guessing the latter, but someone should ask anyway.
In the case of people not opening messages, there are two main scenarios that come to mind:
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The recipient is new to the boards and hasn’t yet noticed the notification that there is a message for him/her. That happened to me as a recipient when I was new here.
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The recipient is a member who is either not that present, or generally doesn’t log in every time s/he reads the Chiffboards (whenever they do stop by for a read). You can’t see a personal notification without logging in. Related to this, the recipient could be just a “drive-by”, as we call it. A wave and a hello, and then it’s toodle-oo Chiffers, it’s been grand but I must be gone now and on my way to elsewhere bump my Google ratings. Have a nice life, all.
With the above, basically the best guess is they don’t know they have messages, either because they don’t or can’t see that they have them when they’re here, or not here, in which case, well…they’re not here. Guess that’s what the emails are for. 
Okay, three scenarios, then. 
gainin’ votes!!
I will choose to believe that people are preparing themselves to read a message from moi.
…and pass out just as they become ready?
sending you a PM. get ready.
Umm, if this was me, I have an excuse . . . and I’m very sorry . . . but I had several PMs at once and thought I was just seeing the same one. Almost nobody PMs me, so having more than one at that time, and having already answered a couple, I got confused.
That PM indicator thing isn’t in my line of vision when I’m on the board, either.
And one night, I fell asleep and accidentally erased all my email, eliminating any PM notices.
Now I’m worried that I never answered at all.
You were one of a few people who delayed in opening up a recent pm’s. This happened once before. I thought a pattern was developing or something. I rarely pm anyone. I’m just glad it wasn’t a problem that was my fault.
I’m still working on that pm to you Denny, you keep getting ready. What color are you now?
I only know about a pm because i get an email telling me. I notice new emails.
But accidentally erasing all emails while falling asleep, whow quite a feat! You have my congratulations and commiserations!
Yes, it was an impressive feat. The best part was that I shut down the software, too, so it permanently trashed all the deleted email.
This did not occur because I fell over onto the keyboard, either. No, I was sitting straight up, neat as a pin, with just a finger on the delete key.