Cannot mail gold to my alts

I do see your petition on this, Death.

Please do leave that open so it stays in queue and a Gamemaster can look into this further for you.

If you haven't already, I'd also recommend trying a full reset UI - just to rule out any issues there, it could possibly resolve this for you.

To do a full reset UI, you will want to save your addons in another spot if you wish to preserve them.

Then rename/delete or move your WTF, Cache and Interface folders while WoW is shutdown. Reboot your system.

Note, if you are running Vista make sure your permissions are set so it does not undo your changes.

More detailed instructions for different operating systems, including Macs are here.

http://us.blizzard.com/support/article.xml?articleId=18761&searchQuery=reset%20UI&pageNumber=1

Q u o t e:
I tried a simple reset while the game was running through the /reload ui command and was able to send the gold just fine. What I don't understand is that I tried this earlier today and it didn't work. Just before posting this I was able to get it to send just fine. I'm not sure if it was just something on my end or a temporary bug but it seems to work fine now. Should I go ahead and drop the ticket or leave it open incase it happens again?

You could close your petition if this is resolved. It may have been a case of that characters own particulars not being fully loaded yet. There is patch information - and then there is information that comes down to every character the first time (usually) they login.

If a /reload UI helped, I encourage you to do the full reset procedure - something may not be right in those 3 folders and this could potentially recur. Doing a full reset after any patch of this size is just a good precautionary measure for everyone.