To the screenshot problem: Pressing any valid Amiga Key will cause to leave the level stats screen. So press only non-Amiga Keys like F11, F12, Print, Scroll Lock, Pause or the middle mouse button in UAEs window.
I have not noticed this because I either use a screenshot utility (in E-UAE) or the builtin screenshot ability with the print key in FS-UAE. So use the GIMP (
www.gimp.org) to make screenshots (File -> Create -> Screenshot) or, under Windows, you could also try the Snip utility (enter "snip" in the command line of the start menu). Make some test screenshots to become familiar with the usage of the screenshot programs.
As I do not play under Windows, it would be nice if someone could confirm the usage of screenshotters for WinUAE in the level completion screen.