Running hybrid mobile app locally against Mx 7.23.7 doesnt work

I generated phonegap package from sprint last april and hybrid online mobile app works fine against Mx 7.5.1 Now I upgraded to 7.23.7, rebuild app with phonegap using same package as above, and try to run it locally. I get an endless sprinner and Mx console says the following: Client Running afterNavigation function Client null Any ideas ?  Is  it necessary to generate new package from sprintr to use in phonegap build ?   
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