Hi. Like you, I experienced a number of issues installing Lion over SL. My issues were different to what you're experiencing -I had beach-balling, instability, massive loss of HDD space etc. Just the other day I did a complete HDD format & clean install of Lion and everything is once again working as it should! Maybe that would help you too -but please, do a thorough back-up of all your data, software license keys etc. before doing anything else!