Thomas, I am Manuel, the developer of VectorBits plugins.
I have received a message from Tolu, writing to me about the problem with the Quick Align tool and the undo system. I was aware of the problem back on october and I immediately updated all of my tools, but unfortunately I missed to upload the Quick Align tool to my site. I didn't receive any direct complaints from the users so I wasn't aware of this problem until Tolu wrote to me.
I am sorry for all the headaches this issue has caused you and other users.
Now I have uploaded the correct version of the Quick Align tool in case you want to give it a try.
sorry again.