...in http://www.mirandabanda.org/files/Cog/VM/VM.r2628.

These fix a bug with pc mapping that could cause the Vm to crash on simple loops containing arithmetic on constants (e.g. 1 to: 20 do: [:i| 1=1]).  They also cause the instantiation primitives to pop all their arguments rather than assume their argument count is 0 or 1.  More change info available in the directory.
--
best,
Eliot