Enum in a Typedef Reverts to Default (LabVIEW 2009)

Question

When I add additional items to a typedef'd enum, constants of that enum on some BD's revert back to the default zero index enum value. In the past (8.6.1 and previous), adding items to an enum in no way would ever change constants that were already dropped on a BD. Now, in LabVIEW 2009, when I add items, about 60-70% of the constants dropped on different block diagrams will be changed to default value.
This happens in a "large" enum (~400 elements) that spans about 3 dozen VI's between RT and HMI block diagrams (a total of about 300 instances). This is a mature project that has never had this problem with 8.2, 8.5, 8.6, or 8.6.1...
I cannot post an example, because in the process of stripping down the VI, the problem goes away. It is extremely repeatable in the context of the project, but I cannot repeat it on an individual VI basis.
The current workaround is to edit the typedef'd enum while all referencing VI's are in memory. If the VI's that use the typedef are in memory, they will always properly recompile and maintain the correct constant value. However, if the VI is not in memory, and the typedef is changed, the next time the VI is opened, when it recompiles it will change the constants back to the zero index default value of the enum in only about 60-70% of VI's. Unfortunately, we cannot yet find a common thread in the VI's that recompile wrong, and the ones that recompile correctly. 
Has anyone ever seen this problem? Suggestions?
Best regards,
Jack
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Answer 1

We just realized a flaw in our "workaround", as partially pointed out by Ben (he was probably typing his response as we were confirming it here). If the constant is inside of a cluster on the BD, even if it is in memory, it will null out the enum inside of the constant. Therefore, the "workaround" is to rewrite the clustered enum constants from scratch (in other words, there's no workaround). Two of us spent a decent portion of the morning finally nailing this as the source of what we thought was an unrelated bug... and that's after spending a long day yesterday trying to find a fix. Yes, we feel Ben's angst of reverting back to previous SCC editions and manually editing dozens of VIs.
The severity of this bug is a showstopper for us. We cannot risk adding elements to an enum and consequently have referencing VIs changing their constants.
Force compiling a VI one at a time is not an option for us. I know this bug manifests itself even after a mass compile. So, is there a way to "mass force re-compile" that we could test?
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