Correct.
They stake but take more time. That being said, I have virtualized a windows installation on my Mac with Virualbox because I just don't like having to many orphans. They clutter my wallet. But nothing to worry about other than that.
I know there is a way to "clean" those orphans with -salvagewallet. But I must be using it wrong since it doesn't work for me!
It seems to me that if you were to unload your wallet and then reload your wallet it would probably lose the orphans... right? I think that each time you load your wallet it grabs the wallet transactions from the blockchain not from the memory of the wallet client. I am not positive on this, but it is worth a try I think.
Negative. Unloading/Reloading doesn't get rid of the orphans... It will if you unload from one client and reload on a different one where you never loaded the wallet before.
In version 1.4 I will update the repairwallet rpc command to remove the orphans.
That is going to be a great addition! But does this mean -salvagewallet doesn't get rid of orphans? I know it didn't for me but maybe I use it wrong.
Thnkas guys, yeah what you said was correct, It did stake but I got slightly more coins . The previous 2 transactions didn't go through but the 3rd did. I also think potentially it could do with the mac client becoming unresponsive. This happens a lot if I have the client open(this may have to do with mac laptops sleeping). If I close and reopen, wait for it to load the block chain its fine though and thats when it restacke'ed. Very happy with hobo nickels and must say stacking every 10 days feels quite good

You're right stacking every 10 days is sweet.
I don't think I ever had a "responsiveness" issue. I didn't try the close/open sequence i just let it open and eventually I'd have a successful stake. Talking with Tranz it might be a timing issue with the network. Tranz is looking into a possible solution, but maybe the Mac client is slower to talk to the network and if there is another client staking at the same time, you get the orphan.
On my setup, I use the same physical machine with a virtualization of windows 7 and on windows I barely get orphans where as on the mac it's the opposite... I barely get valid blocks! they go thru, but at a much slower rate!