MQP-ERR-0017 on drill through

[AussiePete2011]

Hi all,
It's been awhile but I would like to know how prevalent this error is for Powerplay Studio 10.1.x users
We've been seeing the error MQP-ERR-0017 appear a number of times now.
Our PYJ files, contain the drillthrough reports path so we're not using the "Drill through Definitions" within Cognos Connection.
In the Powerplay tab in the Admin Console for Cubes we define the path to the reports.. Old school.
This works most of the time but every now and then we hit this error.  It's also followed by the function that's failing "drillThroughConvertDrillThroughContext_Request"
What I've been doing to resolve this in the short term is to recycle the powerplay server service and this seems to resolve the issue for a few days but it's not the best solution.
We've recently updated to FP1 but that has not made an impact on the drill through issue.
I'm now about to start increasing the logging on the powerplay server so I can see if there is a ppesbus server issue.
If anyone else has seen this what have they done and has it been resolved for them?

Thanks in advance
Cheers
Peter