I hope you can help, I am also having problem with apk app launch with white screen. I am using GitHub and Phonegap services.
I have following the instructions as per custom apps section, still could not able to figure out how to fix this issue. Not sure if you have answer to this issue. Anyway I hope you could help..
I have tried moved config.json file out from www to upper directory (still no good)
I have tried moved config.xml and config.json into www and recompiled still no still white screen when load the custom app.
It seems that a few people experience the same problem when using PhoneGap to compile the custom code. Hope to hear from you soon.