Windows ME explorer display

[PD Johnston]

I have picked up a couple of annoyances in my Windows ME
Explorer display.
First, I can't get the file list to display as thumbnails.
That option no longer appears in my Views menu. I can
display large or small icons, list, or details, but not as
thumbnails.
Second, the 'new folder' icon in the Save As dialogue box
no longer works.
Any suggestions about what settings I should check to find
out what's going on?
Thanks
PD Johnston