The pink rectangle pointer issue is the problem of Vista intel gfx driver.
There are three possible solutions:1)
Upgrade your intel gfx drivers.
It should be enough to add -ddsoftwarecolorkey switch to WinUAE's command line. To use the switch automatically with each start of AmiKit, simply edit the AmiKit.ini file located in the root of your AmiKit installation folder and insert the switch into the first line, before the -f switch. So the edited line will look like this:
RunAmiKit = -ddsoftwarecolorkey -f "../WinUAE/Configurations/AmiKit_v1.UAE" -s use_gui=no
From now on whenever you start AmiKit by its AmiKit.exe launcher and press the "Run AmiKit" button, the switch will be applied.
3) Alternative (and not recommended) solution is to downgrade to older emulation engine WinUAE 1.4.6. Download the ZIP archive and copy the WinUAE.exe into your AmiKit\WinUAE\ folder.