I updated my Nexus 9 from Feb. 17. to April 7. There must be at least one important change in the last version, because one for me important app does not work any more, it crashes short after start. I deleted cache and dalvik, deleted the datas of that app and tried again without success. I "downgraded back to LineageOSversion from Feb 17. and everything is OK. What I saw with a quick view in the appmanager: there is a new app "Google-enrollment". I tried my app with this app deactivated without success too.
My device: flounder Wifi, 16G and enough free space, no Gapps, Xposed framework, addonSU.
Spielmops