WF Builder: Container elements sporadically disappear

Hi all,
On a 620, patch 54 system I have container elements which occasionally disappear from the WF builder.
They exist in a flow I've been building and testing for a while, I make some more changes, activate it and then it whines about binding errors - because some container element that's been there for a few days has gone AWOL.
The first two or three times I thought I might have deleted them by mistake, but it's happening far too often. I've found OSS note 821950 "Workflow Builder: Container, data types disappear", but that's already in our system.
Anyone seen this and can shed some light?
Any input appreciated,
Cheers
Mike
(Cross-posted to SAP-WUG and SDN-BPM)

Ah... WF task container. Now we're going back to version 4.0, no? Nice idea though, despite being a bit ... well, "we're not supposed to do that anymore", I did mull it over.
I worked out that I'd have to put about 40 elements across all my WF's into the PFTC tasks. For that effort - if they disappear once or twice a week - it would take me over 20 weeks to come out evens against the effort of recreating the odd one when it happens. That's well past go-live, and well past my time on the project so I think I'll just stick to recreating the odd one as it disappears
Thanks - also to Ramki for convincing me I'm not going insane,
Mike

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