Hi Jeff,
We've been working really closely with the development team on this issue and we've got it running pretty stable at the moment, but we certainly aren't running production loads through it yet.
We're currently waiting for some fixes to come in Maintenance Release 102.04 in January to see if it sorts it out some more. We're currently running on Maintenance Release 102.03 which has helped resolve a lot of the problems to date.
There were a bunch of steps we had to follow which I'm not sure if they would be appropriate for your instance, but I'm more than happy to share then if you're insterested.
The key thing for us now is to develop and activate the flowgraphs from the Web IDE but only execute them from HANA Studio by calling the Stored Procedure created.
Jamie