Really strange cluster isolation problem....

We are still using Coherence 3.6.0 and is experiencing a really strange problem with two test clusters:
Cluster 1 uses wka a.b.c.d:9000 and cluster name "cluster1"
Cluster 2 uses wka e.f.g.h:9000 and cluster name "cluster2"
I can using JMX and log files see that both clusters have started successfully with node 1 (the single wka) using port 9000.
A client program first connects successfully to cluster 1 (using cluster 1 wka and cluster name as above). After the program terminate the same client program is run again this time versus cluster 2 (using cluster 2 wka and cluster name as above) but this time the connection is refused and to our total surprise the error message indicates that the Cluster 1 wka node a.b.c.d:9000 has refused connection and that the cluster name should be "Cluster 1"!!!!!!! We have checked and re-checked that the right combination of wka and cluster name (for cluster 2) is specified on the command line the second time....
Short of a DNS configuration problem (we are in fact using server names rather than physical IPs in the command line overrides) that would resolve the two wka node names to the same physical IP I cant see any solution (not involving woodo, alien intervention and/or the Bermuda triangle) to this behaviour. I actually tried pinging the two host names and could see that they indeed resolved to different IPs to eliminate this, unlikely but possible, problem...
It is my understanding that when specifying a unique wka for two clusters there is no need to set up unique multicast addresses / ports (since multicast is not at all used in this case) - can somebody confirm that this is indeed true or if this could have anything to do with our problem?!
Any suggestions or ideas (in addition to hiring a shaman to exorcise our servers :-)) are warmly appreciated...
/Magnus

After studying the problem more in detail I have come to the conclusion that this indeed seem to be a bug in Coherence 3.6.0. It does however not occur with 3.6.1 or 3.7.0 but if the problem is unknown I would have checked it out...
The problem is really easy to reproduce. Create two clusters (can be single storage node, local or remote does not matter) each with a unique WKA port (of course).
Execute a simple client program (non storage enabled) first against the one cluster then against the other. The program I used just looked up a cache ("near-test") and printed its size (in this case zero since I never loaded anything into the cluster).
You don't need to enable pof or anything specia. The cache-config iin the coherence.jar works fine. I have tested this both on distributed clusters on Linux and locally on a single Windows box.
You will notice that the program works against the first cluster but fails when run against the second.
/Magnus

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<<
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>>
might be better to do :
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