Are you sure you're using the latest BYOND beta release? I'm not able to reproduce the issue at all on the latest.

However, I was able to successfully reproduce the issue on 513.1517, where the bug that caused the window to keep growing was fixed in the skin editor and you mentioned a similar thing happening to you in-game so it might be related. (http://www.byond.com/forum/post/2556611)`
So i figured out what was actually happening
Interface(client/C)
winset(C, null, {"
default_window.child_main.left = "pane_main";
default_window.can-resize = "true";
default_window.statusbar = "false";
default_window.titlebar = "true";
default_window.macro = "macro";
default_window.menu = "menu";
default_window.is-maximized = "true";

So I had that in the code with statusbar as true and it was overriding the skin. Anytime you reconnected it would keep the status bar and make it bigger for some reason. Idk if that might be a bug or not but since I put status bar as false I haven't had the issue occur.
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