If I remove the rankdir="LR" line from the dot file it works fine. The subgraphs are not nested then and there is no "trouble in init_rank" output.
Karin
Input file: b178.dot
Output file: b178.ps
Comments:
dot -Tps graph.dot > graph.ps
trouble in init_rank
virtual 3
virtual 34
virtual 24
virtual 18
virtual 19
virtual 34
virtual 2
virtual 1
virtual 1
R0x80fde18 3
virtual 3
V0x810f344 1
V0x810f338 1
H0x80fd990 1
V0x80fddd0 1
H0x80fdd94 1
H0x80fddd4 1
V0x81053e0 1
V0x8105428 3
virtual 1
virtual 1
virtual 1
virtual 1
virtual 1
virtual 1
virtual 1
virtual 1
virtual 3
virtual 1
R0x810f310 1
R0x80fd8f0 1
R0x80fd28c 1
R0x80fdd68 1
R0x81053b8 1
R0x8105400 3
R0x80fb2f0 1
virtual 1
virtual 1
virtual 1
virtual 1
virtual 1
virtual 1
and so on...