Spaces seems to be buggy. 1. Applications seem to randomly jump around. Open it in one space, and shortly thereafter it is in another space. 2. Photoshop Elements in particular, when opened in a space (I like to keep it in its own space), always is hidden when I go back to the space it is opened in. Or as in #1, it jumps over to a different space. 3. Tabbing between windows of an app does not work if they are in different spaces. The combination of the above makes the Spaces completely unusable. What good is it to have multiple desktops if the behavior of apps and windows has become completely random? I am forced to disable Spaces at this point as a previously usable feature has become "not ready for prime time."