Trouble uploading edits via osm2go 0.7.0 and API 0.6

As the OSM servers are up and running since Tuesday, I did some live mapping using the famous osm2go yesterday. Unfortunately it has problems uploading the edited data. The error it emits reads as:

Uploading to http://api.openstreetmap.org/api/0.6
Create changeset failed, code: 417 (Expect rejected)
Upload done
Process finished.

Others also had similar problems, so it should be possible to locate the issue during the next couple of days.