@fbertin When looking the address change transaction for today we see lots of them going through. I have tested it as well and encountered no issues changing. Would you mind sharing a screenshot (minus any personal info) you get on that page? At what exact step? Or is it just a 500 error that show up upon starting to type the new address? 

@Bernard Koodo thanks for your prompt reply! I am sharing some screenshots with you. The 500 error show up just after clicking the Save button.

Thank you again!