An invalid or illegal string was specified
div.innerHTML = wrap + elem + wrap;
This error occurs in line 4448 of jQuery.js. After this error, the second attempt to attach a file works, but not exactly the way that it's supposed to. Basically, the filename ends up in the filename entry box, and clicking post will upload it. However, multi-file attachment doesn't work.
Has anyone else encountered this before? More importantly, how can this problem be fixed? It occurs with the latest trunk version of the forum module, and was tested with Firefox.