Problems switching between Spaces with 4 finger swipe

Hi,

I purchased a Macbook Pro with Lion about a year ago and for the most part, I couldn't be happier. One of the things I especially enjoy is the ability to have multiple Spaces open, allowing me to have less clutter per desktop and letting me easily switch between applications. That said, there is an irritating bug that has begun to significantly annoy me and I wondered if anyone else observed it and also if there are any known solutions.

If I have multiple Spaces open, say the first has Google Chrome, the second has MS Powerpoint, and the third has a full screen iTunes, I could be working in Powerpoint (Space 2), move to iTunes (Space 3) to change a song, then swipe back into Powerpoint (Space 2), and the Powerpoint space will lock into place for a fraction of a second, and then instantly swipe itself on into Chrome (Space 1). Furthermore, if I am in Chrome (1) for a period of time and swipe into Powerpoint (2), the same thing will happen, but I will swipe back into Chrome (1). If I immediately swipe back into Powerpoint (2), the Space will stay, but only the second time.

Has anyone experienced this problem and is there a way to fix it?