According to the web page, bugs should be filed on the mailing list. I have two. Bug #1: If I create a 3d box with corners 1e-5 apart with 5e-7 characteristic length at each corner, the program crashes. If I do the same with 1 and 0.05. This is with the stable source code version Bug #2: Compilation of the stable source code fails if GL/gl.h is missing. The configure script misses this on linux. Thanks, Juan