When clicking on a PDF file to view it, a window pops up to show it loading with the message "Initializing...". After a while, you notice that the window is indeed frozen and there is no progress in getting the PDF shown.
This is because of a conflict occuring between Adobe Reader X and Chrome PDF viewer.
What you need to do:
1. Type "chrome:plugins" in the address bar in Chrome
2. Search for "Adobe Viewer X", then Disable it
3. Search for "Chrome PDF viewer", then Enable it.
After this, everything should work once again.