Why might Finder appear broken with question marks in the toolbar?
Those seem to be missing apps.

You can "fix" it by removing them:

Press the command key and click the item, move it out of the toolbar until it vanishes.

If you need to find out what those items may be, take a look at the system log:

open /Applications/Utilities/Console.app

Check the System Messages (all) and try to click one of those question marks, because you have a hang, the system will log it.