Well I believe with your prior account status you should not be allowed to add/update/edit current decks at all, only to submit new ones. So if true then it works because you were not allowed to update?
Clearly a bug, but Alex already is chasing quite a few more serious ones with minimal funds.
1. Adding images doesn't give you any points/XP, is that correct?
I don't think Alex has fully worked out the points system yet, nor has he published the current formula that I know of. I know in prior iterations/owners it was intentionally vague to minimize the risk of people gaming the system.
2. How long do reviews typically take to be approved? I did submit several over the weekend.
The page for approving reviews is broken, via a php bug. I had assumed it was not yet implemented, but given I know you and others were submitting them I let Alex know it's a major bug. Hopefully that gets fixed in the next set so those can be approved.
3. Is there a bug with this particular deck? http://www.portfolio52.com/deck/3160/view
It persists in showing up in my collection, no matter how often I remove it.
I don't see anything different with that one and I was able to add it to my collection, refreshed and saw the total collection count go up. I then was able to remove it and saw the total collection count go back down. I also don't see it in my collection either. I would suggest trying to add it back and then remove it again. Then try the old log out/back in, clear cache, etc.