I know that Scottrade gets its cues from the DTC for adding/removing equities from their "No Buy/Sell Only" restrictions list but I'm not 100% certain what the actual reasoning would be when this happens.
I've seen various penny stocks get listed in Scottrade's "No Buy/Sell Only" list and they all had a price spike a few days prior where the PPS came down to about original levels again.
If I'm correct, the restriction would should get lifted by week's end or early next week.