[sync] Turba contact photos not synced with Synthesis client (Samsung OmniaLite, Windows Mobile)

[Thomas Trethan]

About my environment:
Horde 3.3.6 (stable), Turba 2.3.3, running with https
Samsung OmniaLite GT-B7300, Windows Mobile 6.5, Synthesis SyncML Client STD 3.0.2.24

Basically syncing contact works fine in both directions. Contact photos get synced from the phone to Turba, but unfortunately they won't get synced back when modifying contacts in Turba. The result is, that contact photos are deleted on the phone and remain in Turba, regardless of any further syncs.

/tmp/sync/data.txt lists the photo data in both sections "received from backend" and "converted for client":
BEGIN:VCARD
VERSION:2.1
NICKNAME:
BDAY:
PHOTO;ENCODING=b;TYPE=JPEG:w7/DmMO/w6AAEEpGSUYAAQEBAHoAegAAw7/DmwBDAAg...

/tmp/sync/log.txt show nothing out of the ordinary:
DEBUG:  Sending 1 server changes for client URI contacts
DEBUG:  Sending replace from server: 20100221132611.33961m958i82mulc at mydomain.com
DEBUG:  Sending <Final> to client
DEBUG:  Return message completed

Anyone experiencing a similar problem? Is this a problem within Horde sync or related with the Synthesis client? Any solutions?

Thanks in advance, Tom