.Net 2005 & Common Controls

[Klaatu]

I'm looking for anyone who has had problems with code that once worked and
now fails. In particular, Common Controls. This past Friday (5/5/06), my code
was working fine. On Monday, I upgraded from .Net 2003 to .Net 2005. Now,
I've got some various problems with common controls. For example, tool tips.
I had been using the technique explained in XTipComboBox - Display tooltips
for combobox (http://www.codeproject.com/combobox/xtipcombobox.asp). I used
it on an edit box. In .Net 2003 it worked fine. Now, with 2005 the tool tips
never appear! I've had some other problems with combo boxes as well. Has
anyone run into similar problems? If so, did you resolve them? How?
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Gort, Klaatu, Barrada Nikto...