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I have not used Vicon at all, but I am getting the same kind of error with a node I made for the Bumblebee2 stereo camera. I wanted to use the Triclops library for stereo processing which did not play well with ROS, but I managed to get it working on my previous setup (Electric + Lucid). The problem then was a Boost incompatibility between the Point Grey Triclops library and ROS which I was able to work around by limiting the Triclops library to one thread with a parameter.

After upgrading to Fuerte and Precise I get the same malloc error (more or less..) when starting the node. Where before the problem was a segfault during stereo processing, I now have it happening during camera initialization which uses a wrapper library from Point Grey for libdc1394 which I got to work with the libdc1394v2 ROS package.

I have not yet made a lot of progress in solving the issue, but I suspect a Boost incompatibility again (only seemingly more severe...). I'm not sure yet if the problem is with libdc1394v2 or the Triclops wrapper. I will update if/when I learn more about the problem. Sorry this isn't really an answer (yet), but it wouldn't fit as a comment...