XWindows/Quartz apps on second monitor
I have some Windows apps that I run using WineSkin (I believe uses XWindows/Quartz for the UI). After upgrading to Mavericks they would not show any display to the screen, but I found another thread mentioning that you had to reinstall Quartz after installing Mavericks. That fixed my first issue.
My second issue is when the apps open on my primary monitor on my MacBookPro, it's not possible to drag the open app to the second monitor. The mouse moves across to the second screen but the app window doesn't move with it - the window just moves off the screen and disappears. I can drag any other native OS X app between monitors and that works fine, but an app using XWindows/Quartz does not want to display on the second monitor.