I have 5 spaces. I assigned Chrome to Space 2. When I encounter a pop-up in Chrome, Mountain Lion automatically switches to Space 3 and prevents me from switching back to Space 2. I'm forced to quit Chrome to make Space 2 useable again.
And then, when I restart Chrome, it appears on Space 5. Mountain Lion will not keep the applications on the spaces of which I assigned them to.
Has anyone else experienced these issues? Are there any fixes?