Like many people today I can’t code without a dual display setup but I also belong to the ones that feel the force to upgrade drivers and other software on a perfectly working system.
After upgrading my nVidia display drivers to the latest version (175.19) I was losing huge amounts of time dragging maximized windows from one screen to the other. On most systems (as with these latest drivers) this is only possible by first unmaximizing the application and remaximizing it once dragged onto the other screen. However, for some reason I have always been able to just drag maximized windows in the past.
After loosing much more time searching for a solution and trying other options (keyboard shortcuts, nView buttons) I went for the best solution so far: I uninstalled the new drivers and installed older ones again (which I found on the graphics card manufacturers website - version 91.47 to be precise).
The good thing is that everything works like it did before and I can drag maximized windows again.
Hopefully you don’t suffer from the same window maximizing autism like me but please let me know if you do and have a better solution.