I too have the restarting and config problems.
Running Windows XP (media edition)
LW 4.14.10 pro
Java 1.6.0_03
Norton Firewall & virus (up to date)

I have tried BFU, ran Norton several times, did clean out a "downloader"
Tried different version of Java (as recommended in forum)
Still having problems shutting down LW
Also when I tried configuring LW the option menu flashes and disappears after one second. (Have tried the delete lime wire folder solution but it keeps re-appearing)

Also discovered the dreaded '/ folder and deleted the files through Dos prompt option.

Never had any problems with older versions of Limewire pro.

Christina