LV 2012 Flatten To String / string problems Unflatten

I use a simple flatten to a string in order to save a setup of controls, then a unflatten string read saved orders.  The problem is when I try to read the file, it returns an error message:

122 error to Unflatten string in front Panel.vi Installer

Possible reasons:

LabVIEW: The resource you are trying to open was created in a newer version of LabVIEW and is not compatible with this version.

Which is wrong, because it was created in the same VI about 8 seconds earlier.  Are there known issues with this, or any places that I might want to watch?

Edit: This code correct, unchanged compared to now was working last night without problem.  In fact, the saved files, I have tested with last night are still working fine, but do not load recently saved files.

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