I should have been more clear.
If I use LV6 to convert these VIs to LV5,
LV6 crashes with the following code:
Failure: "undo.cpp", line 3075
LabVIEW Version 6.0.2
For assistance ... (etc) ...So... Yes, there seems to be a real bug but I don't know what the conflict is. Somebody from NI might remember this or you can search the KB here.
It's probably possible to do a few minor changes to the VI to get around this, but I wouldn't know where to start.