I have had a problem with the Nokia Lumia Black update. I had a Lumia 920 phone in which I installed the Nokia Lumia black update, as well as:
- Microsoft Update 8.0.10501.127
- Microsoft Update 8.0.10492.116
- Microsoft Update 8.0.10517.150
- Microsoft Update 8.0.10512.142
After installing the update using my WiFi connection at home, I left my house and then my phone became possessed and managed to download my entire monthly 5GB of cellular data allowance in one day. It didn't stop there, it kept going past the 5GB mark and downloaded more and more data in multiple 127MB blocks. My service provider didn't admit blame as it was a Nokia and Microsoft update that caused it. Prior to the update I would only use on average 100MB of data per day.
I think this is an odd one as my service provider knew nothing about it, they hadn't heard anything about it. I also asked several people I know that own Nokia Lumia phones and they all said that they didn't experience the problem of the massive downloads of data after installing the Nokia Lumia Black update.
I have since upgraded to a brand new Nokia Lumia 1020 phone and don't use the Lumia 920 anymore.