Hi ET,
Some work, some don't ?!
It sounds like we have to chase down the difference.
I could give the standard suggestion of simplifying until you can post an example of the issue, BUT,
by the time you have completed that work, you probably figure out what the issue is.
For the time being, try checking the error cluster return values and use a dialog box to let you know what the property nodes are un-happy about.
That's about all I can do for now.
Ben