Currently Being ModeratedMar 11, 2012 6:36 AM (in response to MacinPad)
I have the same issu on MBP 5,1 late 2008. From time to time i get the spinning beach ball, without an apparent reason. I leaved the mac turned on for an entire night waiting form trim procedures to start and situation was better, but still i have some hanging problems.
I can't downgrade the EFI (is it really possible to downgrade a virmware version??) since in my last firmware update Apple finally fixed a problem of flickering images specific of my laptop version.
****, i guess if changing from SL to Lion the problem will remain...