Using Chrome both on a Mac and PC, I have noticed that if the game tab does not have focus and a new quest is received (e.g. new guild quest, new collectibles spawn, daily quests roll over, etc) then the game will hang indefinitely with a 'Shockwave Flash has crashed' error once the tab has focus again. Only a reload will resolve this.
I suspect many people like myself, play with the game in a tab while doing other things - work, viewing cat videos, etc - and having a random event force a reload thus losing all chat and news history is a major pain.