Hi Again Shai,
Just wanted to let you know I have been able to rebuild the app fairly easily and it is now being tested on an And7 device. I have also run it on 6 and will soon run it on my older test devices, but I do not anticipate any real issues I have not already seen.
So definitely an older app (mine is last compiled Feb '14) can experience graphical issues and may need to be recompiled for android 7.
For others that may encounter this same situation:
I did a new build by downloading Neon,
installing Java 8,
naming my main app the same as before in a new project
adding the rest of the code
editing the main app class (some parts are auto gen and then there is my own code - I took out the all global toolbar true call)
making sure the old theme file and graphics were in the src directory as well
setting the properties
The one real issue that seemed to come up was I was using a now deprecated class "DefaultLookAndFeel" on a derived class of checkboxes - I suspect It was causing my check boxes to be invisible (I did not use the GUI Builder for this app and was painting on my own). this seems to be an easy fix.
Thanks again, Shai.