Url Problem: %2520 --> %20

Lösung 1: (einfacherer Weg)
Select a view with broken images in Thumbnails view mode
Choose Site Actions > Edit Page
From the library Web Part's Edit drop-down, choose Edit Web Part, Apply, and OK
When you Exit Edit Mode, the Thumbnails appear correctly
Repeat for each view with broken Thumbnails

Lösung 2: (mühsamer Weg)
Cloned the view "All Pictures" to a view called "Temp" and assigned Temp to be the default view.
Delete the "All Pictures" view
Clone the view "Temp" to "AllItems" assigning AllItems to be the default view.
Delete the view "Temp"
Set the title fo the AllItems view to be "All Pictures"
Aside from the view GUID everything appears to be identical, but with links functioning properly.