Coordinate Conversion: Input becomes unresponsive after Ambiguous Coordinate dialog ignored. (ArcMap)

[ACueva]

Version ArcGIS Desktop10.5.

Tested against Build: 1413

Steps to reproduce:

1. Open ArcMap and Coordinate Conversion Addin
2. Add DD, DDM, DMS are new output coordinates.
3. In the Input box, enter: 45.0+ 100.0-
4. You should get a the Ambiguous Coordinates dialog box pop up.
5. Close the window without hitting the "OK" button.
6. Enter another ambiguous coordinate such as: 45.0+ 100.0+
7. Note it no longer gives you a coordinate.
8. Close ArcMap and enter the same ambiguous coordinate as above. It now works.

[ACueva]

FYI @nfeuerstein @lfunkhouser @kgonzago

[kgonzago]

@ACueva Will look into it.