Segmentation fault if writing more than 2.5MB of data

[appsforartists]

I've written a Jakefile that concatenates a bunch of XML together. If I split the files every 2.5MB, everything works out splendidly. However, if I bump the limit any higher than that (say 2.75MB), I get this:

Writing partitioned/runstar/000-127.gpx; 2880884 bytes
Segmentation fault: 11

I'm running narwhal-jsc on 10.7.2.