Dashboard can’t create and open report when using flash player latest version.
Current flash player latest version is 20.0.0.0267. If flash player auto update is enabled, flash player will update automatically.
After upgrading, dashboards New and Open button greyed out. Then Dashboard can’t be used.
About this issue, you can refer to following KBA.
2262347 – Can’t create and open dashboard report in Dashboard designer after upgrading flash player to flash player 20 latest version
We need not downgrade from version 20 entirely, as SAP Note says.
If we downgrade to previous Flash version- 188.8.131.52 (released on 12/08/2015), that is allowing designer to load XLF files.