In SM1.1, with QL running and no windows open: 1. Run seamonkey.exe or seamonkey.exe -browser to get a browser window 2. Run seamonkey.exe or seamonkey.exe -[browser,mail,whatever] and no windows show u. Nothing shows up in the JS console.
Note that after step 1, if I open the JS console, then close the browser, seamonkey.exe -whatever still don't work.
Note that it works fine if the first browser is opened from the QL icon in the system tray.
I think this is the same issue as bug 368418.