I use 0.6.0.6.
The QR code dialog works well. However, when I request a payment (e.g. 1.2 BTC) with no label, the QR code showsbitcoin:1wadEz3zGJbwGfgD4Jzhl7aAjz2m2Pthrb?amount
such that the amount and label have to be manually edited in the sending client.
Another issue: Clicking on the question mark on the top right of the QR code dialog does not seem to do anything.
That seems to be a small bug in the qrcode part of the client ... I'm looking into it.
Edit: I created a pull-request for this, if it works, this should be fixed in the next client version