Recently I've notice my MP experiencing some odd behaviours, every once in a while threes a major system laaaag, all input will suddenly cease but there's no beach ball! Anyone else having the occasional lag? I've since disconnected all my peripherals in an attempt to solve the problem. I've even swapped the regular wireless keyboard and mouse for the wired counterpart and it's still doing it!! Arghh.. so damn annoying! Only changed I made to the system over the past couple of weeks is to upgrade Firefox. So.. I'm curious, could the least version of Firefox be buggy? Buggy enough to cause system wide issues? I'm running the british version of 3.0.10. FYI. Running System 10.5.6 with all patches updated, specs as in siggy.