Applications not starting

Is anyone else having problems with applications not starting after turning the phone on and off? I will do this and try to start Market, or Maps, or the Browser and they won't start. There are other apps that won't , but these 3 are the most consistent ones. As soon as I go into Advanced Task Manager and kill all apps, everything works fantastic! I know it has to be an app messing things up, but all the apps I have are ones that others here have suggested and are highly rated in the Market. I've spent the last couple days fighting with this so I was hoping that there was an easy fix besides deleting everything and adding an app at a time to see which one might be causing this.

I had the same problem (and the same solution - task killer).

I cant remember which one I ended up attributing it too. maybe weatherbug? do you have that installed?
i took that and a few other "highly rated" apps off (names escape me), and it hasnt happened since...I was pretty sure it was the weather app tho.

I also uninstalled the (ATK) task killer and have been happier since.