The emulator has to be synced to the display device for accurate scrolling, this means 50/100Hz for PAL software (unless you want to run PAL software at NTSC 60Hz for most LCDs, which screws some software). Running 50Hz settings (PAL/50 fps emulator setting) at 60Hz will visually mess the scrolling. This is admittedly more noticeable with certain games than others, also not all Amiga games featured perfect scrolling anyway. Fire up a pinball game though, or SOTB3 intro, and the difference (PAL settings at 60Hz) is plainly discernible.
However - this is simply a matter of finding the right settings (and possibly an annoyance for LCD users who use UAE for gaming), not a dis on WinUAE which is obviously fantastic.
