My setting. I have two graphs G1, G2 sitting at the top level of the hierarchy. This is accomplished, for instance, by opening a second graph G2 after launching a session with G1.
I have a layout algorithm in a python view. When I run the code on a G2, the layout of G2 is not affected.
If I delete G1, everything is back to normal.
???
Thanks for your report.
This bug is already fixed in the current svn code line (commit #12249).