Entering Matrix Data
It sounds like you aren't getting the meter profile entered correctly. I wasn't able to reproduce the issue, but make sure you tab out of the field so that it accepts the number before you close the tool. I was able to modify and switch profiles and have it restore correctly. If for some reason it wasn't having the one of the matrix value accepted into the profile that could be the reason for the issue. I also know that at one point there was a bug with it accepting negative entries.
I did all my testing with the released version of 5.2Writable Datafields
Entering data into the app.
Add a Datafield:
Set the datafield to one of the x,y,Y writeable options:
The top drop down would allow you to set the datatype from grayscale, gamut, colorchecker, 3D Cube, ect...Static Offset
If you just want a static x,y,Y offset you can enter that on the workflow advanced options:
I hope that covers your concerns, let me know if there is anything else I can clear up for you.