Nexus 4 cannot be recognized as MTP after root
I'm running Windows 7 64bit and followed the Ultimate guide to unlock and root my Nexus 4.
Everything went well but now it looks like that Windows won't recognize my phone as a device. When I plug in the phone, the auto-play window will pop out and recognize it as Nexus 4, but there is no other options. (Normally the auto-play will ask if open folder to view files or transfer photos). I can't see my phone in device manager either.
If I turn on the USB debugging mode, I can see it in device manager but still cannot see it in My Computer. Looks like Windows can't access the SD card at all.
I tried switching to the camera mode but the problem remained. Please help.