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I think this is a fairly common occurrence (I get it a fair bit too) and Navam's suggestion to try a few times tends to work for me also. But, check out this RViz troubleshooting page and specifically section 3.4 "Segfault during startup". I find that setting the environment variable OGRE_RTT_MODE to Copy in my .bashrc file instead of the default PBuffer gives me many fewer crashes. You can also try the "FBO" mode. To test the Copy mode in the current terminal, run:

export OGRE_RTT_MODE=Copy

then fire up RViz. If this doesn't help, try the FBO mode. If you find one that works, put the corresponding export line in your .bashrc file.

--patrick