[WTA] My Roms Problems, some apps can't be installed topic

I have build a custom rom, from original stock system dump
my rom : http://forum.xda-developers.com/show....php?t=2585574

I added some tweaks that is available xda here
change the rom dpi from 480 to 380, and mod every stock apk on the rom

recently I had few user that complain about
Can't Installed some app from unknown source
It says " Application not Installed "
just a few of the apps that doesn't work...

but if Installed every app on the playstore is fine

I running out idea of what cause this
If I back to the original stock system dump *before I modified
I can Installed that app...

so it's a Rom problem

please help me about this