In my Documents tab, I click the PDF button, and the "generating pdf" message appears, but I am never actually offered a PDF.
Disable your pop-up blockers in Google Chrome.
Step 1: Go to Chrome settings > Show Advanced Settings
Step 2: Privacy > Content Settings
Step 3: Under Pop-up's > Allow all sites to show desktop notifications.
NOTE: You can also choose to Manage Exceptions by adding http://ondemand.mymenulab.com/