This is what worked for me:
I went through the whole procedure of getting a new certificate etc, but that didn't help.
After lots of other experiments, I took a look in my ~/Library/MobileDevice/Provisioning Profiles/ and noticed that my most recently generated profile was just not sitting there. I then manually copied it in there, selected it in the build tab of my target properties, and it all starte to work again.
I hope this helps some of you out.
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