Graph takes two times to display

Created by: wassimj

Problem statement

When I open a sverchok graph (using Topologic nodes), I could see from the terminal window that the topologic nodes are executing correctly. However, when the Blender interface finally displays on screen, the visual results are not visible and all nodes report empty outputs. I then have to press "Update all" to re-run the graph and the output is then correct. This effectively means that graphs are taking twice the time to run. Why is that happening? Am I doing something wrong?

Steps to reproduce

1. Install TopologicSverchok
2. Run Blender from a Terminal window
3. Open a sample topologic graph
4. Watch the results in the terminal window and then in the Blender GUI

Expected result

The graph runs once and the visual results displayed in the Blender view

Actual result

Empty screen and the nodes have empty output

Sverchok version

0.6.0.0