This happens to me all the time. Everytime I go to a new thread and try to post something in fact. And I can tell when it's going to happen because the text gets larger than it is regularly. Now, I've just been re-freshing the page before I post anything, which fixes it for me.
Huh. I've never gotten that. Next time it happens, send me a PM and let me know about what time it happened. I can check the error logs and see if I can do something about it.
I've just noticed, when I'm posting on my Laptop, I don't get this at all. However, I do get it on my work PC, my home PC, and on the school PCs... very odd.
I've checked the logs and don't find anything. There's no errors logged by Xenforo. I wonder wtf is happening? Added at: 13:37
Let me know if it happens again. I think I found it.
I discovered that there was an issue with Skimlinks javascript and Xenforo. Xenforo said they wouldn't do anything because it wasn't their script - rightly so. Skimlinks said that Xenforo wasn't a big enough platform to fix the issue yet.
So Skimlinks is currently gone. Doesn't matter that much. I can do without the aggregated $5 generated from it.