Interesting enough, I logged onto my main, when I went to the bank it was completely empty. I then switched to another toon and saw that my bank had dropped back down to 60 slots (had unlocked up to 80) and the 4000+ gold coins were gone. The items that were stored taking up space about 60 were distributed back to the toons that had deposited them, however the gold went "poof".
Now my concern is do I bother unlocking those slots again or deposit gold? Has anyone else encountered this issue?