Ross,
Can you explain a little more about what your setup is?  I notice that neither of your md5sums match with the ones on my system.  Do you have local changes?

Also from the plugin topic menu I see.  
{{{
visualization_msgs::Marker topic to subscribe to. _array will also automatically be subscribed with type visualization_msgs::MarkerArray.
}}}
This might take care of your problem. 

Tully

On Sat, Jan 8, 2011 at 6:08 AM, Ross A Knepper <rak@ri.cmu.edu> wrote:
The documentation for rviz states that you can display "Markers" topics,
of either type visualization_msgs/Marker or type
visualization_msgs/MarkerArray.  However, when I try to display a topic
containing the latter, I get an error that suggests that rviz only
supports the former:

[ERROR] [1294492486.023123523]: Client [/rviz_1294492459278907231] wants topic /podMarkers to have datatype/md5sum [visualization_msgs/Marker/228d1b04f55d36e1f26bac3cbb43a616], but our version has [visualization_msgs/MarkerArray/97a0324c833ce13a630cfa35b6bbe3b1]. Dropping connection.

I tried rebuilding everything in case there was a versioning problem, but
the error persists.  Any idea what I can do to make it work besides
sending out a whole bunch of separate Marker messages?

Thanks ...

 -ross
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--
Tully Foote
Systems Engineer
Willow Garage, Inc.
tfoote@willowgarage.com
(650) 475-2827