Since no one has yet replied, I'll try to help here, but I'm a Linux/sometimes-windows user so my help capability is limited.
Your problem resemble a common problem where a window just sits outside the desktop. After googling, it seems this happens on Mac too. Normally, on Linux desktops or Windows, you can right-click and just use the drag/move option from the pop-up menu so as to drag the window back into view. I understand that might not be available for the Mac window manager, but I might be wrong.
I believe that pressing F8, while Crossover window is active, might allow you to drag the window into place. Not that I can verify this myself. I'm also not quite sure as to how that works, but it should but your desktop in a mode allowing you to drag the window out of that limbo.
I found some mentions that using the zoom option on the menu might also pop things into place, when available.
Lastly, I also understand that deleting preferences for Crossover is also a possibility, but I'm not clear on how to do this. You might want to investigate.
At the very least, this should give you some ideas to google. You can open a support ticket if you like, but I think this is a Mac desktop specific issue, not directly related to Crossover.
Good Luck!