Windows. Verbum 9.11 Beta 2. Bug may not be specific to beta.
Steps to replicate crash:
0. Ensure that Library is sorted by author and that the menu shows your list of tags on the left.1. Open full screen Library pane.2. Right click on a resource and click "Collapse All".3. Left click on one of your tags.4. Right click on a resource title and click "Expand All".5. Observe Verbum crash.6. Repeat 1-5 ad nauseam.