UIInstructionEvent SendAnswer not working anymore

We use the PC SDK to handle UI instruction events of the robot. On reception of a UI instruction event, we show a WPF dialog with the appropriate buttons based on the buttons in the event arguments. When a button is pressed, we use the SendAnser method of the event arguments to close a message dialog.

Recently we upgraded the PC SDK from version 6.8 to 2019.3. Now the SendAnswer method doesn't work anymore. The dialog is not closed until a button is pressed on the FlexPendant. Today we also tried version 2019.5 of the PC SDK, but still the same problem.

Please fix this as soon as possible!

Thank you,
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