I almost submitted this as a bug report but thought it might be a good chance to address this and flip it into a positive by changing it into a proper feature.
When editing a window in the interface editor the position gets saved. Normally this might be a useful feature, but it's implemented in a silent way which causes it to backfire. As of this posting the most recent version of The Saloon was compiled by Mikau, he has a dual monitor setup. Unfortunately, while he was saving the main window it was dragged onto his second monitor. Now whenever someone joins the chatroom its window's initial position is on the far right of their screen, almost completely out of view.
Instead of automatically saving the window position when editing it Dream Maker there should be a section where you can manually set the position. Something similar to the size settings, just have x,y coordinates for where the window is positioned.
If possible it would be nice to have options like center, align left, align top, etc.