Apologies for our lack of response on this topic -- I've been on vacation for awhile and we've all been pretty swamped with work over here.
LimeWire 1.6b beta version, available at:
http://www.limewire.com/beta/1.6b/
addresses this issue by simply making to window resizable on all Unix platforms. Different versions of the JRE clearly handle resizing of dialog windows differently, and it's really beyond our testing capabilities to look at all of them given our limited resources.
Please let us know if the new version gives you any more problems by posting on this forum. Apologies for the inconvenience.