Ok. If you know you aren't going into the gallery here and then trying to go into chat... what else are you doing on your computer before you try to go to chat? On both the days you can get into chat, and the days you can't. Those are the variables I was talking about.

Have you cleared your cookies right here on the site? Go to your mailroom and look for COOKIES alongside the other options of um... Mark all as Read... ??? then click on Cookies and clear all of them. This might help.