I imported my root certificate like described here: http://wiki.cacert.org/FAQ/ImportRootCert#CAcert_system_trusted_certificates_.28without_lockscreen.29
This way I do not have to use a lockscreen. I’m familiar with this process and it worked fine on Cyanogenmod 11 (Kitkat).
On Cyanogenmod 12 (Lollipop) however, DAVdroid does not trust the certificate. I checked Android’s certificate manager, it is there. Web Browsers trust it, even CAdroid skips importing the certificate because it is already trusted.
What could be the problem? Has DAVdroid already been tested with Lollipop?