The model/layout bar under the main view was missing in Ubuntu 10.10. When the bar was clicked, bricscad crashed. This issue was caused by a change in the gtk library. A callback function that used to be triggered when a new document window is opened, is no longer triggered. Among others, this callback function is required for initializing the model/layout bar. The issue has been fixed by explicitly calling the callback function on every action that opens or creates a new document.