The HTML files for the layouts have never shown on Mac but you can save SVG files of the layout and open them. I don't use them anyway so it's never been a big issue for me but using the SVG files would allow you to control how they appear on a page so you could get several on a single sheet if you want.
I have V4.1.5 on my MacBook running 10.6.8. The text fields are black but the text appears in white. I understand Steve has some plans this winter to make some changes to the plugin and this may get addressed.
As for the Print Preview issue, I've never heard of this before but I'll look into it. For my use I generate a CSV file, manipulate it in a spreadsheet application and then print that so I've never actually tried printing the list that is displayed when the plugin runs.
Edited to add: I tried the printing thing and have no problem with any tools in SketchUp afterward.