Do you experience problems during downloading?
Check your connection in Status and Interface settings window.
Use Test Server in Config > Servers.
We will probably ask you to do a test using only basic settings.
Do you experience problems during repair or unpacking?
Enable +Debug logging in the Status and Interface settings window and share the relevant parts of the log here using [ code ] sections.
Just noticed that the button-icons at the top of the default screen are affected too: http://i.imgur.com/VKOVAe3.png
200% zoomed in
Top: how it looks
Bottom: how it's supposed to look