I am using 10.9.3 Beta. https://appleseed.apple.com/sp/betaprogram/landing
To be honest, I started using the Beta which was publicly released prior to buying the new monitor. So I never tried it on 10.9.2. So it could be coincidence that the 10.9.3 Beta version is what resolved it. However, as of two weeks of using the beta, I have had no issues with the OS. It runs just as well as 10.9.2 with some performance improvements. I use my Mac extensively for school, work, video conversions, CAD, and other process intensive apps with no problems to report.
Hope that helped. You can sign up and download the beta version of OSX 10.9.3 that is open to the public and see for yourself. I would recommend it.