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It's still intermittent.

TIP: If you get onto the Purchased tab - don't restart the App Store - you could lose it again.
 
Only if the download did not complete (can anyone confirm this?). For those who want to download the whole thing again (e.g. for another mac) have to wait until the Purchased Tab is back up and running.

I installed on my mac pro (purchased there) then went to my mac mini, opened the app store, clicked the lion link on the front page and clicked install.
 
I installed on my mac pro (purchased there) then went to my mac mini, opened the app store, clicked the lion link on the front page and clicked install.

Doesn't seem to be the case here... well at least everything seems to be working now... more or less.
 
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