Got the following warning when moving around dashboard components and then refreshing the dashboard page:

user warning: Table 'example.dashboard_page' doesn't exist query: SELECT page_id FROM dashboard_page WHERE uid = '3' in (path-to-site)/sites/all/modules/dashboard/dashboard.page.inc on line 204.

Looks like the query referenced in dashboard.page.inc may not be accounting for the database prefix (example_). Aside from the warning, the result is that the re-arrangements aren't getting saved.