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,
Joost
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