Hi, Running Firefox 15, and the most current Flash (as of an hour ago), on XP. I take an online math course through my college, and it uses Flash to show the problems that I do in my assignments. Periodically, it will totally stop working, and fail to load my problems (hereinafter referred to as exercises, to prevent confusion). It has stopped loading exercises again, as of yesterday. Plugin-container gets stuck and the whole browser freezes (requiring me to shut down plugin-container via Task Manager). Tech support typically has had me add several websites to various trusted/allowed lists in FF. These websites disappear off those lists periodically as well (not to mention Windows deciding to not "use Windows to automatically configure network settings" periodically). Those sites have been restored to the various lists on which they need to be. Tech support is unable to resolve my problem. I tried disabling crash protection, to no avail. I tried creating a new FF profile dedicated to my schoolwork only, no luck. I tried resetting Firefox, no luck. I encounter the same problem in Chrome and in IE. HELP!