Hi,
This is probably a really dumb simple question, but I seem to have paste a copy of my object to the canvas, making it look as though I have one object that I can move around and one that is locked where it is. This has happened to me before, and pressing ctrl+z does not work to undo it. Please help me! :o
Layer - Clear Layer or - Ctrl+N
AH! So Simple! Thank you so much! 
You must be using 4R2. That is a known bug in that version. Upgrading to 4R3 will fix it.
It’s not completely fixed in R3. I just haven’t taken the time to replicate it but it’s not as prevalent as it was in R2.
I’ve been using 4R3 since it was released and it hasn’t happened to me yet, even after trying to replicate it several times. Do you know someone it has happened to?
Yeah, me. 
I haven’t taken the time to replicate it but it doesn’t seem random as when it happens it’s always when I’m doing the same general thing. Once I get more time I might try to duplicate it more consistently and report it.