the m2e-android team found a serious issue with the way project configurators are ordered with the new runsAfter/runsBefore directives in m2e 1.6.0. This would lead to configurators being completely ignored and generate Plugins Execution Not Covered errors.
Hence, I staged m2e 1.6.1, fixing that issue, available in the milestones update site. We'd appreciate if developers of 3rd party configurators could check it works for them.
If no regressions are found, I'll release m2e 1.6.1 on Monday 26/06/2015. m2e 1.6.1 will be added to the next Eclipse Mars SR1 release, in September.
"Have you tried turning it off and on again" - The IT Crowd