my account id: 15oejBEzUE1EPXncpQfXThNmqJvVWPY9os
Congrats! Here is your 20 mBTC. Have fun

Should I backup that file so that I could restore it if I reinstall on the same computer or on another?
Can I have the same ID on multiple computers at the same time or should they stay unique per computer?
I see the 20 mBTC on the account page.
But it's not on the blockchain:
https://blockchain.info/address/18P5aa4tfPbSuPeVpdAvHossQkWrZ6TK2gYes, please backup that file, or use it on two computers. You can have two or more BitWrk clients using the same account ID at the same time, but not too many. At some point, performance will degrade. Two is probably not a problem. Your mileage may vary. BitWrk has its own accounting/ledger system, that's why you don't see a transaction on the Bitcoin blockchain.
Just placed an offer for 10 uBTC. They seem to expire rather quickly.
Error performing sell (delaying next sell by 20s): Error awaiting transaction: Bid expired without match
Is it because no one is buying at the moment?
Also 10 uBTC per order or is it time based?
Oh and one more if you dont mind. Do I have to change settings in blender to allow GPU usage? Its currently running in a VM without proper GPU setup, but I will probably change that in order to offer helpful amount of rendering power.
Correct, probably nobody is buying. At the moment, buyers are a rare species. Building a functioning eco-system seems to be the hardest part. That's why I'm advertising BitWrk mainly on Blender-related boards, where chances are higher meet potential buyers. By the way, BitWrk really needs all the publicity it can get (*cough*Twitter followers*cough*).
All bids time-out after 2 minutes if they're not matched. You can setup a
mandate to automatically enter a new bid.
WRT to GPU, I actually don't have any experience in that area yet, my hardware is all AMD based which isn't yet supported by Blender on Mac OS X.
By the way, is your IP 95.90.xxx.xxx? Please make sure that port is really open. I recommend using
http://www.yougetsignal.com/tools/open-ports/