The project tracking page for the is located at the following URL: http://scidoner.com/apps/tracker/browse/UCWS

You can submit a new bug report by clicking the Create issue button at the top right, or clicking here. Please make sure that the uTorrent Client (Windows Store) project is selected.

Please make sure you search for your bug before submitting it - someone else may have already reported it!
You can do that by clicking here.