Hi Matt, unfortunately Apple made a lot of changes in how multi-monitor stuff works in Mavericks, and it's causing a lot of various different problems.

But from what I've heard it should be possible for you to change a OS setting to make things behave like they used to before Mavericks and that may help to avoid this from happening.

The setting is under System Preferences > Mission Control - uncheck "Displays have separate Spaces" there.

You will then need to reboot your system in order for this change to take effect.

Does it behave any better after that?

- Michael