Internet Explorer 7,8 Content Type In Meta Tag

I've recently asked a question regarding IE8 issue. After some time the problem was solved by removing one css class from style sheet file. But I could not understand why removing

Solution 1:

I think that IE7 and 8 have a problem with the shorthand font rule, where you specify all the variations in one go - there's something it can't handle, but I can't remember what off the top of my head. Try splitting out into font-size, font-family etc and see if it fixes it.