Steve, what version of Windows are you running? It seems you have some scrolling behavior setting set to minimize graphic usage (either in Windows or X2).
The only thing that comes to mind offhand is in Win7... Go to Start, type in "perf" and select "Adjust the appearance and performance of Windows" The first page that pops up is default windows appearance (which it will apply to ALL windows open unless overridden by the program). Try enabling all of them ("Adjust for Best Appearance" at the top) and see if this helps you... the ones that stick out in that list are "Fade or slide menus into view" and "Fade or slide ToolTips into view"
I cannot remember when those settings "take" so you may need to close reopen X2. See if that helps any.
I am glad Jlien X jumped in here! I never even thought to check X2, I am sorry.
Edit: I just ran through X2's preferences and do not see anything "obvious" in X2 (Preferences->Customization->Display/Colors) to override Windows, so am assuming that you have a global Windows setting that is causing this behavior.