Cannot upload changes after a JOSM edit.

[Steeplejack]

What steps will reproduce the problem?

1. Load JOSM by double clicking .gpx file, then download osm data.
2. Make any change or addition.
3. Upload data.

What is the expected result?
Create Changeset. authenticate. Upload. Close changeset.
What happens instead?
Unexpected exception. Always a coding error. unexpected format of id replied by the server, got
Please provide any additional information below. Attach a screenshot if
possible.

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2010-09-15 06:22:51
Last Changed Author: stoecker
Revision: 3530
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2010-09-15 08:21:16 +0200 (Wed, 15 Sep 2010)
Last Changed Rev: 3530

Identification: JOSM/1.5 (3530 en_GB)
Memory Usage: 57 MB / 494 MB (21 MB allocated, but free)
Java version: 1.6.0_18, Sun Microsystems Inc., Java HotSpot(TM) Client VM
Operating system: Windows 7
Dataset consistency test: No problems found

Plugin: openstreetbugs (22723)
Plugin: remotecontrol (22734)
Plugin: validator (22805)
Plugin: wmsplugin (22964)

org.openstreetmap.josm.io.OsmTransferException: unexpected format of id replied by the server, got ''
	at org.openstreetmap.josm.io.OsmApi.openChangeset(OsmApi.java:321)
	at org.openstreetmap.josm.io.OsmServerWriter.uploadOsm(OsmServerWriter.java:192)
	at org.openstreetmap.josm.gui.io.UploadPrimitivesTask.realRun(UploadPrimitivesTask.java:236)
	at org.openstreetmap.josm.gui.PleaseWaitRunnable.doRea

[bastiK]

temporary server error?