I get a blank screen after logging in.
A blank screen is usually an indication that there is a pop-up blocker running on your system which is preventing the main presentation window from launching properly. If you do not know how to disable your pop-up blocker, and the address bar for the blank browser window contains the following text:
Please modify the text so that it reads:
This will bypass the pop-up blocking software preventing the presentation from loading properly.
Does this solve your problem? If not see some other options below.