Let's try rebuilding Finder preferences...
Go to Finder "Go" menu hold the option key and choose Library. Then go to Preferences trash these files:
Then, restart, or log out and in again.
(You will have to reset a few finder prefs the way you like them.)
None of this helped my problem so perhaps there are mulitple issues with Finder and the Open File container in Mavericks. For me the problem was that after some unknown period of time after starting Mavericks the Finder would become unresponsive to opening new folders with a spinning gray wheel. In addition some apps were unable to populate the File Open container file list. The Console showed that com.apple.IconServicesAgent had extremely high CPU usage and a very high CPU Time. The Console showed hundreds or more errors for com.apple.IconServicesAgent. Using the Activity Monitor to "Quit" -> "Force Quit" com.apple.IconServicesAgent resolves the problem temporarily. I tried the network fix but the problem came back. I deleted the Finder plist and the problem came back.
What has seemed to work was deleting the "com.apple.finder" cache folder. I found this suggestion here: https://discussions.apple.com/thread/5472367?start=45&tstart=0
Ok, I think I solved this problem.
Here's my solution:
1 - Kill "com.apple.IconServicesAgent" using Activity Monitor
2 - In Finder go to "Go to folder" under "Go" menu and paste: ~/Library/Caches/
3 - Delete "com.apple.finder" (save a copy as backup if you want)
4 - Kill Finder
That's it. Let me know if this works for you, it did for me.
If you don't have the same problem as I described then this may not help you but it has solved the problem here.