Hi. I use Snow Leopard 10.6.1 on my Macbook Pro '09, 2.26 GHz, 2 GB. Due to slightly slow system performance, I cleaned all the system caches through Onyx and Snow Leopard Cache Cleaner. Thereafter, strange things are happening after each startup. Sometimes, the trackpad won't work, or keyboard shortcuts like Cmd+I , Cmd+O won't respond, forcing me to restart. Even my custom keyboard shortcuts are not working most of the time, which is perplexing me, for the behavior, either expected one or erratic one, is not consistent. It works at times, and does not at times. What's wrong here? Need some urgent advice please.