It happened that the Images didn’t show up when you uploaded them ??
Example: new logo or user profile Image?
Took me time to find it but anyway:
Login as admin go to the settings icon on the uper-left-corner
Follow these steps: Administer>Site configuratiion>File System
Now check the Download method: to Private – files are transferred by Drupal.
Thats it, At least this worked for me !
if it didn’t help try enabling cleanURL’s
Altin Ukshini 
Many thanks for the tip!
i saw so many discussions on that issue with in-depth and complicated solutions. this one is so simple, and… works!
thanks!
Awesome, worked like a charm.
Thanks
thanks a lot, that worked for me (1.0-beta10)
ditto… it works!