This new Knowledge Base Article that was published recently addresses:
In the CA Performance Center (CAPC) web UI a generic "HTTP 500" error may be seen instead of the expected Dashboard after setting a custom date and time range.
Its Document ID is TEC1610582
Its direct URL is:
http://www.ca.com/us/support/ca-support-online/product-content/knowledgebase-articles/TEC1610582.aspx