The contacts app is the stock Android Contacts. Importing to any contact account (yahoo, gmail, internal) other than DAVDroid works, so this is not that clear.
No error message when disk is full
When there is almost disk free on the phone, DAVDroid stops syncing without notifying about the reason. A short message like “syncing failed: no space left on disk” would be great. It took me some time to figure this out.
Thanks for the app, it is great!
Merged into #182, please follow up there.