Just got my Marshmallow OTA update this morning (Z5 on Bell Canada network). Everything seems to have worked except for Google Play Store and Services. "Unfortunately, Google Play Store has stopped." messages... same for Services. Anyone know how to fix this? I've cleared caches and updated to the latest versions of Store and Services found at apkmirror.com
We had the same issue when we upgraded to MM - the only way we eventually solved it was doing a clean wipe / hard reset unfortunately.