HT204379 "source" locks at "loading" and no image-screensaver can be selected

The problem that I am experiencing (and many others like me as I have noticed in several fora) is that the "source" when selecting an image screensaver blocks at "loading" while nothing happens and no (folder or aperture library) source can be selected. The problem started basically since Apple blocked the possibility to use a folder with images in subfolders as source for a screensaver as used to work perfectly in Snowleopard. But while Mountain Lion only works with iPhoto or Aperture libraries it made the system susceptible to windows like errors.
When selecting a slideshow-screensaver, the source remains as "loading" where no options are given to select anything. It used to work until a few months ago, but I have no clue why it stopped or how I can get it to work again. When the slideshow screensaver is selected I get an error message telling me there was an error connecting to a netwerk server. No clue why it actually needs that server (which died some time ago). If i shutdown systempreferences while the slideshow is still selected, each time it tries to start the screensaver I get the same warning that there is a problem connecting to a (dead) airport extreme.
I have tried to reinstall Mountain Lion, rebuild a new Aperture image library, remove certain .plist files that may be connected to this as was suggested in several fora, nothing works. I cannot imagine that Apple forces me to abandon Mountain Lion and to go back to Snowleopard over a screensaver.
A hint to third party developers: please create a simple slideshow screensaver where you can select a folder including subfolders. It can't be that hard to create (although Apple fails completely).

Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Click the Clear Display icon in the toolbar. Then try the action that you're having trouble with again. Select any messages that appear in the Console window. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V).
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.

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HT204379 "source" locks at "loading" and no image-screensaver can be selected

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