For no apparent rhyme or reason Vista will decide to show a folder that was previously in details view to start showing thumbnails. I go to the folder and right-click, Customize, and set it the template to "All Items", and "Also apply this template to all sub-folders", but it some point it will again decide to display it as thumbnails. Is there a way to force this setting to stay, or is it that possibly something is changing it that I am not aware of?
There seems to be multiple things that might cause this as an issue, and multiple resolutions as well, hopefully solving or making this "bug" appear less frequently.
Trying some of these additional tweaks might help, mix it with it and see what you get.
You can increase the size of the folder view cache as well.
This should do it, or rather, perhaps improve the experience. Nevertheless, using an application as CCleaner with the wrong settings can disrupt and delete your settings, so be aware and checking before you use applications focused on "cleaning up".
I had this issue until I disabled UAC. It seemed it took administrator privileges to save the view setting.
I admit I tried no other solutions, so perhaps there's a better (more secure?) remedy.