Changes were applied to improve security. See ADV-2018-001, 2018-002, 2018-003 and 2018-004 in Security Bulletins for more details.
When connected to a cube datasource, filter selections in Multiple Values (Custom List) filters were not shown when printing a dashboard to PDF.
Workbooks connected live to an Excel file data source would sometimes fail to display the latest data upon opening the workbook, requiring a manual data source refresh. In those cases, even after you refreshed the data source and saved the workbook, old data would be shown if you closed and re-opened the workbook.