Is the application maximized?? Aside from a known bug in Microsoft Excel, you should still be able to grab the title bar and drag a maximized application from one screen to the other. If not, trying "un-maximizing" the application and then moving it.
Another possibility is that your screens are "backwards". It is possible to move screen-orientations. If you go into display properties and find the properties where you set your screens to extend to both monitors, make sure monitor 1 and 2 are on the correct sides. You can drag the screen to the other side by clicking and dragging. Then try to move the applications again. So if what you think is the left mintor is really on the right in this screen, you need to reverse them.
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People think it must be fun to be a super genius, but they don't realize how hard it is to put up with all the idiots in the world. (Calvin from Calvin And Hobbs)
Robert L. Johnson III
CCNA, CCDA, MCSA, CNA, Net+, A+, CHDP
VB.NET Programmer