I think this is a regression, because in build19 this never happens:
1. Start building a road
2. Try to connect to a flag where connecting is not possible (e.g. all 6 directions are already used), or click to an unreachable place (e.g. a tree) -> The action window of road is opened showing 'Build Road' and 'Cancel Road' buttons
3. Don't close the action window, instead immediately click on a flag where it is possible to connect the road with
Result: The action window of road stays open. This happens only if the road get immediately connected to a flag. If you click on another place where the road could be build, the action window get closed.
This happens regardless of setting "Start build Road after placing a flag" is turned on or off
In build 19 the action window get automatically closed every time a road get successfully connected.
Caused by the following commit: http://