We have now published a Knowledgebase article - http://support.microsoft.com/kb/2933444 which gives the SQL command to update the stored procedures in a Project Server 2013 database to avoid the ‘lost resources’ condition described in the recent blog post - Project Server 2013 and Project Online- What happened to my resources-. The KB article also contains a script that will assist in detecting if any of your plans are affected by this condition. This KB is only applicable to Project Server 2013 as Project Online has already been patched.
*** Update 2/18 - Looking to get the KB updated - but we incorrectly refer to the upcoming April 2014 CU as the April 2013 - hope this didn't confuse anyone too much - and thanks to Mike Wahlman of Project Hosts for pointing this out to me ***
If you have any questions then don’t hesitate to open a support incident. Thanks to Aik, Adrian and Rogério for all their work on this issue.