Odd layout changes appear in IE

Hello!

I have been trying to get my site to work properly in IE for a few days now and am at my wits end. Everything works fine if I disable the NiftyCube module so I am seeing if I can find any information here.

Here is a link to the development site for your review.
http://drupal.freightsecurity.net

First off, before the page loads, make sure the cursor is outside of the browser window.

Once the page loads, the corners of block elements on the left side of the page are not rounded as they should be. BUT, the text IS in the right position. Also, the main menu is stuck, positionally, too high.

Now move the cursor into the browser window.

At this point, the corners properly round and the main menu area drops into place.

HOWEVER...

The text that was correctly inside the block elements has now moved way off whack and the actual main menu links have jumped to the top of the page!!

Now, if you hover the cursor over any of the main menu links, they will fall into their proper place.

Here is another interesting tidbit of information that I discovered last night. If you load the page, with the cursor outside of the browser window, then go to another IE browser tab and change pages in that tab, the elements on the page in question will be in their proper positions if you return back to the original tab. CRAZY!!

I would appreciate any insight that you folks may have for me. If this is posted in the wrong spot, please let me know and I will adjust properly. Also, if there is any other information that I should provide, just let me know!

Thanks in advance,
Erik