I tried to check in our own Web site, but also, to be sure the error wasn't only on it, I tried in a text box from here, forum.languagetool.org.
I can't send you a link from our Web because it's private.
It only occurs in one PC. Some days ago LT extension didn't worked fine (I really don't remember which error gave), so we uninstalled the LT extension. Since that, always appear that message to reload the page. It's on windows XP.
On the other pc works fine and some are XP too, but others not.
Thanks to answer!