On Linux, COMSOL 3.3a is compatible with MATLAB 2007a if the following patch is applied.
Instructions for patching COMSOL 3.3a:
cd /usr/local/comsol33/bin
comsol:
cp comsol comsol.origpatch comsol {download directory}/comsol-ml74-linux.patchAlternatively you can set the environment variable BLAS_VERSION to refblas.so:libflblas.so.