13Jul/100
iOS4 codesigning
Apple changed code-signing without updating the documentation. My clients reported problems, so I had to scour forums to find out what the problem was.
The first thing to mention, is that an app cannot be codesigned for ad hoc and appstore distribution at the same time anymore. You will need to get your provisioning profiles again.
I got things working back to normal by doing these two tasks.
-Rez