no progress bar for Mavericks download
I'm trying to download Mavericks onto my MacBook Pro, Lion, using the App Store. The button changes to "Downloading", but I don't see any progress bar anywhere - not on the Mavericks window, not in "Purchased" (Although Mavericks shows up there with "Downloading" on the button, too.). I tried downloading Mavericks once before, but got an error when it started to install because, apparently, a partially downloaded version of Mavericks had been set as the Start Up Volume. I just recovered from that, and I'm trying to make sure I'm only downloading one Mavericks, and how long it's got left, but I have no way of telling either. Any suggestions?
MacBook Pro, Mac OS X (10.7.5)