Dragon Mahjong froze twice within a short time. The first time Mahjong froze when I was also whispering to someone and received a notice from Treasure Fishing.
The second time, I went to look at CREWS in between, and when I returned to my Mahjong, it was frozen.
I did receive a refund after I restarted 7 Seas in both cases.
Ive been getting that but only when i look at crews, so i make sure im not in a game or party now when i check our progress and stuff. i think theres still a few crew glitches that need to be ironed out yet 
I was also just at a party (Roscoe13 for 240 gems), and the screen froze when I was typing a whisper and the bonus box notice popped up. Argh… 
oh bum thats annoying 
hope they fix it soon
I was about to enter Dragon Mahjong when I decided to check CREWS first. I hadn’t started a game yet, but after leaving CREWS, I clicked on ENTER for Dragon Mahjong, and the screen had already frozen.
We’ve had the same issue in Lilypond, as soon as you change the screen the cards disappear, I brought it up in the forum but haven’t heard back from them yet. It is very annoying.