Updated: November 7, 2016
When clicking into the plan tab in DPA for SQL server instance you are monitoring, no plans are display and collected.
A bug in Microsoft SQL Server 2014 causes the DMV sys.dm_exec_requests to have a NULL value in the query_hash.
Because of this, DPA is unable to link the Plans to the queries.
User will see something like the image below:
this was patched in this bug fix release
"FIX: The values of column query_hash and query_plan_hash are NULL for DMV sys.dm_exec_requests in SQL Server 2014 "
Patch the SQL server that is being monitored to allow DPA to not have nulls in this dmv.