I managed to sort my issue with regards to signing my apk and updating an older CJS google play store listing.
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I also get the blurry image issue even on small images. I have to set the high DPI to yes to make smooth graphics for my app. I believe this will give a performance issue on most phones though In CJS all my graphics were fine with that turned off.
hmin
I also get the half black and white screen on startup. Sometimes I also have my splash screen displayed even though when I build it I request it is not shown.
I've also have some strange issues that my app will sometimes load incorrectly.
If you have wifi enabled then the app displays a black screen for a few seconds and then will load fine.
If you have no internet connection then the app will freeze on the startup screen. You can get around this by pressing the phone home button and then the app icon again. But doing this it jumps to the main menu and the physics gravity set to 0 does not trigger, Very odd!
It seems it may be related to having teh clay.io plugin for my app but I will have to experiment to check and see if I can get some simpler capx as examples.