Room Tracing Problem

I have started a new project and defined the floor. I have tried to begin tracing in the rooms and have encountered an issue. I click the Trace Room icon and insert the room type and name. I then click on the starting point to trace the room and the red tracing line appears. As soon as I click on the second room point the red tracing line disappears? There are currently no rooms within the project. Any advice would be appreciated.

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