Comment 5 for bug 488035

(Question 2): I did not edit any nodes. (Question: 3)Ok, I deleted prefrences.xml. It still crashes.
Steps:
1. Launch inkscape.
2. Select "calligraphic tool" in the left panel
3. Choose any color (but not black) from bottom panel
4. Draw something.
5. Switch to node edit (F2), you will see nodes
6. Hit Ctrl+z = crash
Instead of Ctrl+z you can open "Undo history" and click on "Unchanged"

Error message looks like:
Inkscape encountered an internal error and will close now.
Automatic backups of unsaved documents were done to the following locations:
        C:\Documents and Settings\toto\New document 1.2009_11_26_02_49_45.0.svg

Here is backtrace.