In OS X, from Lion onwards, when I click on some of my folders in Finder and the title row of the files contains the usual stuff like "Date Modified" and "Size". However unlike the old Finder view I can't click on them to sort. Why is that and how do I make it never show up ever again?
Check out In OS X Lion, Finder will not "Arrange..." from Apple Support Communities.
You'll find how to solve that problem:
There seem to be a few glitches in the Arrange/sort model. You can actually Arrange by and Sort By separately. You can get to the Sort options by holding down the Option key while selecting the Arrangement button.
However, there aren't any sort options when you Arrange by Name. And it doesn't change the sort by option when you switch to Arrange by Name.
Try setting the Arrange by to None. Then, hold down the option key and press the Arrange button. What is it sorted by?