Hi, thanks for your quick response. I don't have a second keyboard unfortunately. Yes a powered usb hub could poss sort the power issue but also at the same time i don't think it would resolve the midi quit / connection issue. that said i hadn't considered the poss that it may be a kbd fault. It would however be a real coincidence that this all started when i upgraded to lion. It all works great most of the time. I'll have to see about borrowing another kbd to see if i still get the same issues.
Thanks again for your suggestions.
My experience with Lion was great for a while, it was effortless, everything I had attached still worked with no problems aside from needing occasional drivers. Once Lion 10.7.2 was released, I updated my system and again, no problems. If I recall correctly, 10.7.2 was released in October. Suddenly in December, I began having random software and midi issues all around my system. I do not use Mainstage but I have noticed others have had similar problems with various software and USB midi controllers, and have not seen a fix.
I regularly use Pro Tools 8, Ableton Live 8 and occasionally Reason 5. I also have an M-Audio Axiom 61 and Korg padKontrol attached via USB. After about 2 months of trouble-free operation, Live and Reason would not open and the accompanying software for my padKontrol no longer would either. These apps would just "hang" and I would eventually have to force quit them. In addition, Audio Midi Setup would also hang when attempting to switch to the midi preferences page. Pro Tools still worked, but I could no longer receive midi signals. I also use a wireless USB stick to connect to my home wifi signal and that no longer worked and neither did the accompanying software.
It's possible that there are deeper issues in your system as well as mine and the others having similar problems.
At times, I wonder if there is some kernel errors embedded in my computer. I got my MacPro when Snow Leopard was fairly new and had numerous kernel errors resulting in many applications not functioning. I eventually sorted them out but ran into similar USB related issues with the Snow Leopard 10.6.8 update, so I remained on 10.6.7 until Lion was released.
The only successful fix I've had is switching from Lion back to Snow Leopard 10.6.7 after erasing my entire hard drive. I've tried reinstalling Lion through both upgrading from Snow Leopard and a clean install of 10.7.2 after erasing my hard drive again.
I believe my USB and midi problems stem from kernel errors somewhere but cannot find them (I have used Disk Utility many times). I really liked using Lion but I lose so much functionality and my internet connection so I have determined that I will not be using it. I may try Lion again when 10.7.3 is released but am wary. If anyone has ideas on how to fix these issues, I would love to hear them.
Hi mhede -- My thoughts on Lion are exactly the same. I don't quite understand some of the in depth bits you have gone in to but they would seem correct. I am going to do the least expensive but most time consuming thing i can do which is to reinstall snow leopard and everything else and see what happens. It is a real shame but i need some operational consistency when i'm gigging. I'll report back and post the outcome. In the meantime, should you come across any potential fixes i would be grateful if you could let me know. Happy days!!! Mark