The only time I have ever had a login problem it turned out to be a browser problem. Maxthon wasn't working properly, switched to commodo dragon no more problems. I've been on this site for two and a half years, and on three different computers. I have never cleared the cache or history or anything else. Any problemsI havehad are ALL browser issues. You must find a browser that works compatibly with your operating system. I hope that helps. Any questions feel free to post on my wall. That also goes for all WGT mods who would like more information on this.
Steve