Same here, displayport colors all burnt, and the luminosity of some web video increased to a high level. Uninstalling the drivers made everything go right again. I think I'll stick to the old, more reliable drivers.
update: 15.12 did not fix this
Instead it got more bugs with it. "Lisäasetukset" (whatever it is in radeon panel "more settings"?) won't open anymore. [ps. give me english version of crimson]
And now it seems to run 2 drivers at the same time. (so your amdcleanuputility.exe doesn't work either)
I am running Drivers 15.7.1 which should NOT contain crimson. right? some reason its up and running ahahahahahah.
Last night i found forum full of people having the same problem and here is how you can get colors back to your display ports:
Goto your AMD Radeon settings -> Display -> Additional settings -> My digital flat panels -> Choose correct display from drop down list -> No need to change anything unless you want to -> Verify
All DP colors should be fine now!
Another solution is to set your refresh rate to 75 or upper to get your colors fixed (from windows desktop settings).