Apps Automatically Get Backgrounded / Unselected

Since I upgraded to Lion, apps continuously get "unselected" or "backgrounded". So I am looking for some help on this topic.

I will be typing and suddenly the window is unselected and I am typing into nothing. (has already happened once since I started this message) So I need to reselect the window to keep typing. (2nd time, now since start of message)

It is not a matter of accidentally touching the mouse pad because you need to physically click it to select things.

To test things out, I run 1 application at a time to see if there is one in particular causing this but it happens to all! (Safari, Chrome, Word, Skype, etc.)... Oh, it just happen for the 3rd time.

It is annoying because it prevents me from running apps in full screen since. (4th time) Apps exit full screen automatically when this happens. (5th time)

I am seriously going crazy and would appreciate any help on how to resolve this.
Thanks in advance! (6th time)

Cheers

 

Bump... sorry to bump this.

I could really use some help.

 

Mac Book Pro 15-inch, Mid 2009
Processor: 2.8 GHz Intel Core 2 Duo
Memory: 4 GB 1067 MHz DDR3
Graphics: NVIDIA GeForce 9400M 256 MB & NVIDIA GeForce 9600M GT 512 MB
Mac OS X Lion 10.7.1 (11B26)

I had no problems before upgrading to Lion. Snow Leopard worked great!

 

Bump
I'm still looking for help. Anyone?

Thanks in advance.

 

I thought I would share the cause of the problem. For some reason it was happening every 30 seconds this evening so I closed every process one by one running in the background.

Although I had thought of turning off Growl, there is a Growl Helper process that runs in the background. This somehow was not always properly working and whenever I was suppose to see an alert, it would just background / unselect whatever application I had open.

It turns out that growl 1.2.2 isn't really compatible with Lion. You need to upgrade to 1.3. Unfortunately, the sad thing is that you have to pay for it now.

Anyways, I hope this helps someone else. It drove me crazy for long enough.

Cheers