Exporting APK from eclipse (ADT) silently crashes

Disable Project/Build Automatically when you are exporting

I think is a problem of Eclipse unable to detect the Android command is still working or something similar.

Of course there is ever the option of APK generation using Ant outside Eclipse you can generate an Ant build.xml from your Eclipse project more info in official Android docs

Disable Project->Build Automatically. I've noted that this works for me.

Disable project/build Automatically before export the apk.