That's not a new Vista feature. Folders randomly change view settings in XP too. I hope at least the default folder view makes sense usually in Vista, unlike XP.
I had a better handle on them in XP, especially with tools like TweakXP or even TuneUp Utilities for XP. Once I set the folder settings storage limit from 400 folders to 9000 I never had to alter the view for my folders unless I created a new folder, and even then it would just be for that new one. That was almost a year and a half ago, right up until I formatted and installed Vista.
The only thing I'm grateful for in Vista is the absence of that annoying filmstrip view.
Vista seems to change folder view and selected columns on a daily basis with what seem to be illogical choices. For example, if I have a folder with 16 MP3s and 1 JPEG it considers it a photo/video folder. Go figure.
If I have a folder full of video files only the automatically selected columns are "Name" "Date Taken" "Tags" "Size" and "Rating" three of which are completely useless to me (Date Taken, Tags, and Rating). It always reverts my detail view to those columns.. The columns that are useful to me in a video folder are Name, Size, Date Modified, and FRame Height.
Here's another inconsistency in Vista: on the desktop you can select "Classic" as the view, which basically makes the desktop icons 32x32 as per all previous versions of Windows default setting. That option is not available in any folder view at all. The only way to get icons at 32x32 is by holding ctrl and zooming out till they're at that size, and even then the icons are tiled with the label on the right rather than the classic style.
Sometimes I like the 32x32 icons size, sometimes I like 48x48, why can't I have the choice?
Anyway, I guess we can all agree that Vista is really a flop and a heck of a learning experience for Microsoft. Frankly I hope they offer free Win7 upgrades for anyone who purchased Vista.
EDIT:
Here is the TweakGuides solution to the everchanging folder views. It's been updated and should work. I've just followed the instructions and will let ou know if it indeed the settings stick.