I totally forgot about posting this message here - I've tried all your suggestions, but nothing works. Here is my scenario:
I have one lister style "Thumbnail Gallery" which is single pane, folder tree, thumbnail display. The background is gray in color.
I have another one called "TV Download" that is dual pane, details mode.
If I click on "Thumbnail Gallery", I get the proper format as set up in preferences. However, if I click on the "TV Download" lister tab, instead of details, it is the same format as the "Thumbnail Gallery" tab - gray and thumbnails. If I click again on "Thumbnail Gallery", it goes back to details, but the background is still gray and not the system default. Only if I navigate out of the default folder for the left pane (either by entering a subfolder or from tree) does the proper background appear.
Thanks again for helping.