I've found that while using two different versions of chrome (on my personal computer and one on a public computer, believe a 64-bit ver and a 32-bit ver but could be wrong with that), that my game will occasionally freeze (only tested US6 but doubt it's world-specific). It won't refresh the page so have to close the tab and re-enter the URL in a new tab (I find that if I just close and ctrl+shift+T it tends to work temporarily, then freeze again). The freezing exclusively seems to occur when descriptions pop up next to my mouse on mouse-over of various options. I seem to get it most commonly on sending attacks and in the tavern. For sending attacks, when I mouse over an officer and the description pops up next to my mouse. For the tavern, when I mouse over a countermeasure and the tooltip description pops up next to my mouse.