MBP Retina shows wrong resolution on external display since 10.8.4

I have a MBP retina and I'm using it with an external display, Dell U2711, connected via a Mini-DP to DP cable. It all worked amazingly well until 10.8.4 came out. Now, when I connect the display, it no longer shows the correct 2560 X 1440 resolution, but shows 1080p. The displays preferences pane does not allow going over 1080p. It does recognize the display model, though.
It started with one port. The machine has two TB ports, so one of them worked fine and the other didn't (the one closer to the user was acting up). Then it degraded further to the second port. Now, if I plug and unplug several times and fiddle with the displays control panels, I might just get it right eventually. It takes some time, but eventually the machine gets it right. At least that's what I've been experiencing in the last few days.
I don't think it's a hardware issue. It's possible that my cable is at fault, but I seriously doubt that. I'm wondering if anyone else got the same problem, just checking before I go and splurge on a new cable (these cables are not easy to find).
Thanks,
Z

This worked for me:
Step 1: Delete system windowserver preferences
In the Finder, from the menu bar, select "Go -> Go to Folder..."
Enter: /Library/Preferences/
Delete the file called com.apple.windowserver.plist
Step 2: Delete user windowserver preferences
In the Finder, from the menu bar, select "Go -> Go to Folder..."
Enter: ~/Library/Preferences/ByHost/
Delete all files that start with com.apple.windowserver   (On my rMBP, there was one file called com.apple.windowserver.12AFB147-95D6-5C70-8F62-C1E4F2BE81BE)
Step 3: Reset the PRAM    (These instructions are fromhttp://support.apple.com/kb/HT1379)
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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