This problem is reproducible on multiple computers with Gutsy and sunbird (either 0.5 or 0.7): some themes cause the program to crash with a traceback very similar to above (e.g., Redmond), while others (Human, Clearlooks, Raleigh) allow the program to work fine. The crash always occurs upon spawning a secondary window, or upon starting the program with no existing profile (which is probably also starting a second window).
This problem is reproducible on multiple computers with Gutsy and sunbird (either 0.5 or 0.7): some themes cause the program to crash with a traceback very similar to above (e.g., Redmond), while others (Human, Clearlooks, Raleigh) allow the program to work fine. The crash always occurs upon spawning a secondary window, or upon starting the program with no existing profile (which is probably also starting a second window).