GS 6.01 and GSView 3.4 disagree

[François Robert]

Dear NGs

I stumbled on a very weir behavior, trying to render (on Win32) this
extremely simple code :

133 10 55 230 10 sub rectstroke

GS 6.01 shows me a rectangle. But GSView 3.4 (and 2.9) shows NOTHING.
However, if I do :

133 10 55 220 rectstroke

GSView is happy and draws the same thing as GS 6.01. Note that the second
code snippet should have the same graphical effect as the first one.

What's going on ?
__________________________________
François Robert
To mail me : reverse order of all characters in address