Page Lists Plus uses the addmetabox() function to create new fields on the Write Page and Manage Page screens. This function doesn't exist in versions of WordPress earlier than 2.5.
Some themes style Page lists assuming that every list item will contain a link. On these themes, unlinking an item will cause styling problems. If you know CSS, then you may be able to fix the styling by editing your style.css theme file. If not, then as a fall-back enable the "Unlink using javascript" option on the Settings > Page Lists Plus page in the dashboard.
No. At the moment, Page Lists Plus is not WPMU compatible.




