It's the first time I hear NextGen making such a problems.
I would recommend that you clean the system (cache, some tails..) first, maybe some of the previous installations of the igo (if any) left their traces.
And, what is very possible is that there is a conflict between Primo and Next Gen if they are the same publisher (Israel) and have them both in same time. I had a similar problem with Primo 2 and NG Israel last year, not with res then with mixing some data. Anyway.
Do not mess up with sys file. Uninstall the application proper (force stop, clear cache, clear data, unnistall), and then install the make_sys version of apk.
And as the ultimate solution, try some other edition - Gift for example. Use apk that have name Gift after installation.
And, give name to folders exactly - for Primo only iGO, for israel iGO_Israel, for Gift - iGO_Gift...
I think I've covered all the solutions.