I'm having this issue with IE and Firefox.  So, I don't think it is an IE thing.  It is also weird that it does not always do it.  Yesterday I it was working great.  Today if I click back an fourth between HTML an Edit it adds a bunch of <br>'s to the code every time! 

Sebastian, I downloaded and installed the CKEditor, the issue I have with that is that it DOES NOT WORK AT ALL?  When I edit content the editor simply does not show up.  It will sometimes tell me there was local content that was not saved and do I want to compare.  I see the compare window come up.  Then when I go into regular edit mode the editor window simply is not there...... Very odd...  Seems like a great editor, but odd that it does not show up on my site?

Also, what is funny that in this post I'm writing which I assume is one of the DNN providers, I can click back and fourth on design / HTML and not have an issue..... Very odd.... I'm wondering if it has anything to do with the fact that my site has been around for a long time and has been through many upgrades of DNN?  Could there be 'crud' in the system?

Thanks....