I am not sure exactly how long this has been happening because most of the time I use the BBCode method to add my images via Flickr to posts, but whenever I try to use the "Upload a Photo" button and the dialog box pops up to select an image, I get the "spinning beach ball" and Safari is completely frozen. Hitting the cancel button has no effect, and I have to Force Quit Safari using Activity Monitor. I have a 2 year old iMac with lots of RAM running the latest version of OS X Yosemite, using Safari as my default browser. I tested and found the problem does NOT occur when I use Google Chrome, just Safari. Rebooting the iMac does not solve the problem. It occurs 100% of the time. I know I have uploaded photos successfully in the past (using the current Xenforo software), but in the last week or two I have been unable to upload anything without crashing Safari. Is anyone else having this problem, or does anyone have suggestions? Thanks.