moodle 2.5 Display errors see attached file
The one that does not work is using Chrome as the browser and url ictvle.com
I would first check to be certain the browsers are up-to-date. I have also seen similar situations when an incorrect url format was used.
I too run into that problem with Chrome on occasion. Restarting the browser fixes the problem, but I haven't found a way to prevent it from happening. Incidentally, I only get this behavior at work, behind tight firewalls and a particularly annoying content filter.