So you've received your T10! Maybe it's your first Popplock and you have big expectations(you should!). You put the key in and begin turning frantically. A few discoveries later and you can't remove the key. But you should be able, you just had the key out. After some more frantic turning, the key is out. but now you can't put it back in! What's going on here? Maybe your lock has been gripped with "death lock" and the key is almost impossible to turn. Looking for a solution to your problem? Look no further.
It's fair to say now, that this blog post contains very minor spoilers to the mechanisms of the T10. I'm a solving purist and I would not be upset at hearing any the information contained herein. I've remained as ambiguous as possible while being clear and concise in troubleshooting.