plotlines does not work

[Jürgen Borries <j5borries@arcor.de>]

I use this:

plotinit(2,400,400)
plotlines(2,200,200)
plotbox(2,300,300)
plotstring(2,"TEST")
plotdraw([2,0,0])

Plotdraw() opens a PAINT window. The size of the picture ist 302x302 
pixel. I see the string "TEST" is at the right position (200,200). But 
there is no diagonal line and no box. The same happens with plotpoints().

What is wrong here? Please help me.

I use win7 pro 64:
                          GP/PARI CALCULATOR Version 2.9.3 (released)
                  amd64 running mingw (x86-64/GMP-6.1.2 kernel) 64-bit 
version
                    compiled: Jul  4 2017, gcc version 6.3.0 20170516 (GCC)
                                    threading engine: single
                       (readline not compiled in, extended help enabled)