Tried to find this thread before but I couldn't, so I posted to General Discussion. The same thing happened to me, i'll re-post my thread because it goes a bit more into detail.
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I decided to try out Quinn and Valor on the PBE. She's a fun champion and I think I can really get into her... but there's a major bug that occurred while playing.
When I was running, I used my ult to gain extra movement speed to run from the enemies. I didn't use the active on the ult, and decided to go back. After I went back, I never went back into "Quinn" form.
I have tried having them kill me and tried ulting again, but nothing will switch me back into Quinn form. This is a major bug that needs to be fixed, because I basically ruins your gameplay as Quinn.
Here's a picture showing when I went back as Valor, showing my ult cooldown while I'm still in Valor form: http://imgur.com/p0CU61i
Here's a picture showing when I ulted again, showing it did no damage and didn't switch me back to Quinn: http://imgur.com/YwPMVPw