I had this problem when I was running Backside CM7, and now with Quattrimus CM9. The market stops whatever it is doing once the screen goes off.
I'll be downloading an app or getting some app updates and it works as long as I keep the screen on. I can have it start to download updates, set it down and come back a few hours later and it will have downloaded the first in the list, but be stuck on "installing". None of the other items have downloaded. After a few seconds, it installs the one and starts downloading the next. Happens every time.
I can temporarily disable the screen timeout, but it's annoying to do that all the time.
I'll be downloading an app or getting some app updates and it works as long as I keep the screen on. I can have it start to download updates, set it down and come back a few hours later and it will have downloaded the first in the list, but be stuck on "installing". None of the other items have downloaded. After a few seconds, it installs the one and starts downloading the next. Happens every time.
I can temporarily disable the screen timeout, but it's annoying to do that all the time.