Hello,
I'm using Xamarin Studio on Mac OSX 10.8.4.
Following the instructions in the publishing article, I set my application to build as release, published the app with my personal keystore, and tried to install it on a device. The installation failed and I got the error message "App Not Installed".
The device has the setting Security > Unknown Sources checked. It has no SD card, and no .android_secure folder or file that I can see. I found one thread on the web that suggested my version of the Java jdk might be at fault.
When I needed to use keytool to generate the keystore, I downloaded and installed jdk-7u25-macosx-x64.dmg from Oracle, installed it, and used the keytool to generate the key. My Mac is a 64 bit mac with a Core i7 processor.
We have tried installing the apk file built through this process on multiple clean devices, but each one returned the error message "App not installed".
I plan to uninstall the jdk and install an older version, regenerate the keystore and rebuild my apk, but that's mostly hope, and if it doesn't work I'll be totally stumped. Any other advice or suggestions are most welcome. Thanks!