Mac OS X is automatically quitting my apps

It's got my colleagues and i (all a bunch of geeks) stumped.

Thing is, I don't try and reboot my MacBook Pro everyday like I did when I had my Dell. Uptime's now at 110 days.

Problem is, after I'd closed the MacBook Pro for some hours(?), and I flip it back open, I'd either get a bunch of warning messages telling me that Mac OS was unable to successfully terminate certain processes or I'd be logging back into a session that does not have a single application (on the Dock) left open.

If I had VmWare running, I'd get those warning messages I mentioned earlier. Or if I were in XCode and forgot to save something, same warning messages.

Anybody got any ideas?

Thanks heaps!

Er, 110 days!!! how about a restart?

Your machine is being memory starved. Reboot it and most of those problems should go away. Applications like Safari are known to leak memory so you can imagine keeping the machine up for 110 days is not going to help.

And what version of OS X? If OS X.6 an update, OS X.6.7 came out a month or two ago and should be updated which requires a start.

You've missed the Safari update, possibly the 10.6.6 as well as the 10.6.7 updates, and also many others.
This would be a good idea.
Mac OS X v10.6.7 Update Combo