Photoshop switching to active window, won't run in background.
After a recent update Photoshop keeps making itself the active window (on Windows 7) rather than running in the background. This makes multi-tasking difficult. When Photoshop starts it keeps switching itself back to the active window - this can happen three or four times during the startup process. Running contact sheets it makes itself the active window every time it opens a new file to paste onto the contact. So I can't work on email and leave contact sheets to run in the background any more. Please help.