Today, several times already, when I try to open a topic, this message come up, after 1, sometimes 2 time i clos the window, the topic open regular.

next time it happens can you post a link to the topic you are trying to open?

Also, are you opening it from the main forum page or from a view new posts page?

From a view new posts page. Next time I'll check the topic

This is the topic > Challenge #9

Are U using Firefox?

yep

Try deactivate your add-ons.

Works for me, using FF 3.5.3

Had the same problem with my net bank.

But instead I use explorer with my bank now.