I haven't seen the problem on any of the machines I use.
You might post what Operating System and browser you are using. And if you can, get a better description of what the message says. It may be some third-party software (anti-virus for example) that could theoretically be causing the issue.
It's probably part of the myriad problems I'm having on this machine then, Martin. :( Windows 7 -- 64 bit (stay far away!!!!), Google Chrome. The error appears in a pop-up that magnifies, then decreases in size, and leaves before I can read the whole thing. When next it appears, I'll look for a different part of whatever it's saying unless, of course, I've seen and stated (above) all of it; I can't be sure at this time.
I have three browsers on my machine, each for a different purpose; I'll see if this happens with IE8 or Firefox. Thank you for giving me the idea to check this. :)
Okay. I had two things mixed up.
This one says, "An error occurred during AJAX response parsing.
"The error response will appear in a new popup."
I have a new computer that's giving me phenomenal amounts of grief; therefore, I don't know if this problem is mine alone or if it's a site problem. Quite often when I'm in Tactics Trainer, practice mode, I get a notification that there's a script error that's being written to some log someplace that I can't find. That's the end of whatever I'm doing in Tactics Trainer; I have to exit it and come back in. Is anyone else having this problem? Thank you in advance!