If you were able to open LW, then chances are your system is compatible with the minimum requirements of LW 5. However, some people find the new LW 5 a little too heavy to run on their systems, not behave well, etc. like you have. You might wish to downgrade back to LW 4 which will most likely behave well for you. LW 4 also has more tools than LW 5. See more about downgrading here: http://www.gnutellaforums.com/mac-os...0-5-later.html