On further testing using images from http://www.clker.com/clipart-red-t-shirt-10.html, both the small (100x73) and large (600x440) png images (which get cropped into squares by OwnCloud).
These images don’t disappear when I make a new contact with them and some group information and then modify it on the phone. Several of my currently existing contacts’ pictures, though, definitely did, as documented above. This is kind of weird.
I have tested this on the Galaxy S3 with Cyanogenmod 11 and an emulated Nexus One running Android 4.4.2.
Thanks for the help. I do have external storage, but I haven’t used adb - it shouldn’t be a problem if you happen to have a link I can take a look at to guide me.
First was an upgrade then a fresh, all through Fdroid. I also tried an earlier (0.8.4) version. I added and removed the account multiple times to test.
Your error report is not related to tasks, but the calendars (Authority: com.android.calendar, request is for VEVENT).
This is an internal server error, possibly for the same reason as https://forums.bitfire.at/topic/1024/owncloud-this-recurrence-rule-does-not-generate-any-valid-instances/ and https://forums.bitfire.at/topic/1031/caldav-sync-no-longer-works-backtrace-with-owncloud-7-0-4-after-update-to-davdroid-1-x/. Please see there for a workaround.