Perhaps something was changed...
I had a problem once (I changed settings un-intentionally) and my desperate way of fixing the problem was removing and then installing DSS from fresh... only then I found out what I have changed (it was automatic removal of hot pixels... big no-no! This results in all the stars look grey, and you had to have darks anyway).
Your problem may be RGB-calibration setting - it should be "Per channel calibration, I had problem with that once)
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