The DynamicTwinView false also works for me, I have a two-screen setup that uses an emachine monitor (eview 17f3) and a Vizio HDTV and never had the correct refresh rates displayed for either, I believe 50Hz was shown for both screens. Adding that option shows the correct refresh rates for both screens now, with the CRT running at 1280x1024@60Hz and the HDTV running at 1024x768@75Hz.
The only thing I notice right away is that you can't use the twinview setup through nvidia-settings like you could before, which only makes sense since it's disabled now. Not a big deal to me since the screens are already set up how I want them.
I'd also like to mention that you can also check to see what refresh rate your monitor is running at by checking the on screen display if there is one. Even though KDE was showing 50Hz as my only option for vertical refresh, pushing the button to bring up the OSD for my monitor always showed 59.9Hz when I was running at 1280x1024. Another way to check vertical refresh, if you are using an nvidia card and the proprietary drivers at least, is to run nvidia-settings and under the opengl settings for your monitor check the Sync to VBlank box. Then run glxgears and the output should give you an idea. Doing this on my box gives something like:
303 frames in 5.0 seconds = 60.450 FPS
301 frames in 5.0 seconds = 60.023 FPS
301 frames in 5.0 seconds = 60.030 FPS
Which fits pretty well with what I already know it's running at.
Thanks for the fix