Fresh clean install of latest core under MAMP. Bartik theme.
Using latest dev versions of Calendar, Date, Views and Ctools
Calendar, Date, Views, CTools, (and Admin menu and Module Filter)
Steps to reproduce problem:
1. Create new content type Event
2. Add a Field of type Date to the Event content type. Accept all defaults
3. Add view from template "A calendar view of the 'field_date' field in the 'node' base table"
4. View displays. Click SAVE
WSOD appears, but view appears to have been created ok.
System logs shows one warning:
Message: Theme hook not found.