Quirk in scenario editor

I recently found another new quirk.
When you try to add to front or back or make a drop off. You can pick the siding, but when you try to pick the cars they do not select. I discovered you h ave to close the command window, conect to front or back and drop offs, then when you open it again you will be able to select the cars you want for that operation.
Along with the bidirectional error giving a red x when you know it is right, save and then reloading the scenario usually puts things right again.
Thats two very strange quirks for editor.
When you try to add to front or back or make a drop off. You can pick the siding, but when you try to pick the cars they do not select. I discovered you h ave to close the command window, conect to front or back and drop offs, then when you open it again you will be able to select the cars you want for that operation.
Along with the bidirectional error giving a red x when you know it is right, save and then reloading the scenario usually puts things right again.
Thats two very strange quirks for editor.