C:\Program Files\Chimera\bin\mscalc.exe 1.400000 2.000000 1
Calculation of some surface components failed (code 5).
Falling back to single-component calculation.
C:\Program Files\Chimera\bin\mscalc.exe 1.400000 2.000000 0
Surface calculation failed, mscalc returned code 5

Two pdb files that I've been having problems with are 1JFF and 2P4N.

I see this error frequently myself - for example, 1ffk on Windows XP with Chimera
build 2450.

Dave