Thanks for your post.
As far as I know, you are the only one who has come up with a repeatable demo of this issue. Definitely worth following-up: I'll try to duplicate your results of shifting views due to simple browsing in Open dialogs. We can call this "Save Dialog View Instability" (SDVI) until someone comes up with a better term. (This term doesn't clearly cover Open dialogs for example.)
Trying TextEdit [v1.7 (288)]… Yes, I see it. (I use my HD root directory as a test case, too.) Here's the procedure and results:
0. Finder: View --> "Show View Options".
1. Finder: Open HD root folder, observe "icon view", my customary icon arrangement, and "aways open to icon view" in "View Options"
2. Finder: Close HD root folder.
3. TextEdit: File--> Open
4. Open Dialog: Click on HD at left
5. Open Dialog: Click on "Column View" at top
6. Open Dialog: Click on some folder in HD
7. Finder: Open HD root folder. SDVI: The view is now columns and "always open" is set to column view.
I note:
o Step #2 is necessary; the issue doesn't affect an already-open window.
o If I skip step #6 there is no change.
o This only occurs with respect to column view. Can't get a change to Cover Flow, for example.
o Clicking the icon view in the open HD root folder restores my customary icon arrangement and checks "always open in icon view". (So this is only part-way to icon mal-rearrangement.)
o Strange that it occurs for me in Text Edit and not for you. Maybe a version difference.?
Checking with some other versions and apps:
--A quick, similar experiment with TextEdit [v1.5 (244)] on a 10.5.8 system: no problem.
--A quick, similar experiment with TextEdit [v1.6 (264)] pm a 10.6.8 system: no problem.
--A quick, similar experiment with Pages [old: v1.7 (288)] on 10.7 : partly rearranged the icons, but I can't seem to repeat this.
I think it is slightly arguable that changing the view of a folder in an open dialog actually _ought_ to change the view when the folder is opened in Finder. ("Save Dialog View Consistency"?) In other words, this is a feature. But I'd expect this to be consistent and reversible with all the view types, which I did not find. So, yes, this looks like a bug.
The second step is reproducing icon mal-rearrangement. Probably it would be best if we could identify a piece of software distributed as part of 10.7 that invariably triggers mal-rearrangement. So far, I haven't found one. Second best: the current latest version of a very commonly used app. No luck so far on that, either.
Now that I've seen a repeatable error that almost certainly is due problems with .DS_Store, it seems very likely to me that we will eventually find an app that reliably triggers icon mal-reorganization. What's going on? I'll speculate wildly: Maybe the 10.7 implementors had a goal of coordinating view control in Finder windows with view control in Save Dialogs, but they didn't finish the job. Or, the two viewing situations were uncoordinated and were intended to continue being uncoordinated, but someone slipped and --maybe making something as simple as a naming error--partially coordinated the two.
Do either explanations suggest a workaround? Maybe. Possibly it will help to use only the simple, unexpanded Save dialogs, accepting the default directory or picking one from the Where: list. If the Mac doesn't try to display directory contents in one of the four views, maybe that will be enough. Open dialogs unavoidably display all the files in the selected directory, but… it might be effective to never use Open dialogs for existing files. Instead, navigate in the Finder to view a file you want to open, and simply drag-and-drop the file icon to the app's icon, or an alias of it, or the app's dock icon. Another approach: Are there OS add-ins that provide alternate Open and Save dialogs? (Anyone?)