Below are two techniques to help debug the WSOD (white screen of death), usually a 500 server error, in an ExpressionEngine site. The Basic-Debugging option will be suitable in most cases and is specific to ExpressionEngine. The Advanced-Debugging is generic and applicable to any PHP based software. If the basic debugging does not work, try the advanced.
If you get a WSOD you will need to first get your site to reveal an error before reporting it to EllisLab or the add-on developer. Simply reporting "I get a white screen" does not give the developer enough information to assist you. An error message on the other hand will point the developer to the source of the issue.