Whilst LW is closed try deleting your LW Preferences folder called .limewire & found here: C:/Documents And Settings/your_username/.limewire

Keep in mind your settings will be deleted also so make a note of them before you delete the LW prefs.

What brand name & model number of modem do you use?

After LW has been open for 20-30+ mins can you do this test for us: Bug Report instructions & sample image Is your result True/False?