Firefox works – Explorer doesnt

I am new to wordpress and have just completed the install.

I am sure you have answered this before but your help is appreciated.

I finished uploading K2 and was looking to adjust the height and top padding of the header.

Everything works fine in firefox but not explorer. FYI…Explorer hasn’t made any changes at all.

the sequence of events-
First I adjusted the style sheet inside the admin panel – under appearance/editor. Firefox worked with just this change.

Then I FTP’d my style sheet from my hardrive with the changes and still nothing.

Obviously explorer is looking for something else but I don’t know what it could be.

Thank you in advance.