No notification for missed iCal event/alerts in Mountain Lion?

Question

Anyone else having an annoying issue in Mountain Lion whereby iCal alerts are not showing for events that have been missed/triggered while their Mac is either asleep or occured within the timeframe while the PC is shutdown? No alerts are shown for these event following starting up the machine or resuming from sleep which they defnitiely used to do with Lion. Notification Center only seems to show future events or those occuring "now" (by design?) so right now for myself the only way to know if I have missed something is to trawl back through my days events etc manually.
I've done quite a bit of searching and found only a couple of related references on the web so it does not look widespread but any ideas as to a fix would be greatly appreciated. Upgraded from Lion to ML on a 2011 MacBook Air 11" so nothing unusual etc.
Cheers

Answer 1

Yes.  I have ML 10.8.2 on a 2009 macbook pro.  The Apple store genius was no help.
If I happen to be using my machine at the time, I'll see an alert in the upper right screen the correct amount of time before the item start.  My choices are to close or snooze.
In the prior os, I could select from a number of snooze options and be reminded indefinitely.  Now snooze will remind by default in 15 minutes even if the item starts the next day.  Repeatedly snoozing in 15 minute intervals is dumb.  Plus, if my machine is asleep, the alert will disappear at some point anyway.
If I do nothing, the alert counts down to the start time, displays 'now', and then disappears from the screen and notifications at the end time.  Yet system preferences says notification alerts stay on the screen until dismissed.  So even when my machine is awake, alerts still aren't persistent.  Maybe it's a power nap and app issue as well?  I sure won't regress os-wise.  It took me weeks to recover from the last upgrade and compile a list of everytihing that went south.
I've gone low tech and keep a stack of old business cards on my desk.  The backs contain all the appointments, events, and tasks I need to remember in chronological order.  If an item can be postponed, I move the card to a second stack - my equivalent of indefinite snoozing while keeping the item in front of me.  Periodically, I shuffle through this stack to see what I want to move to the top or act on.  I'd try google calendar except from what I read on forums syncing between these apps is also problematic.