Tools -> Options -> Content (tab)

Play with Fonts & Colors and see if that fixes the problem.  Mine is Times New Roman, 16.

Currently I have 3 browsers : IE8, FF3 and Chrome

I'm usually on FF3.

I must check when it happends don't know that exactly.

By the way, it is the same on chrome and IE :/ crap

It was a joke.  I don't know what's wrong but it's something with your settings, not ours. :P

This thread is an example of pure failure.

Hold Ctrl and use the minus key - or + to change the text size.

I disagree...

There were large amounts of win in certain sectors.

Fine the original post.

Then there is something really odd going on.

Either your browsers hve some shared settings, or there are some settings that browsers take from something else that have mysteriously changed on your computer.

No one else has this problem.