Also if you have internet explorer go to "tools", select "internet options" and then select the tab "privacy". There is a slider there that can go to low/medium/high/block all cookies security setting. I have mine set up to medium, if yours is up to "block all cookies", then you want maybe to decrease it to something like medium... After that you should be able to stay logged in the chromatography forum...
Kostas - I have Internet Explorer; I checked mine, and it's already set to "Low" on that slider.
Right, sorry, we did a good hijack of topic here, but maybe an important one.  So I currently have this issue both at home and at work.  I'd bet I spend 1.5 hours per week at work just entering in log-ons and passwords.  Even for my direct company related stuff, I must have ten different log-ins and passwords; some must be changed regularly, some have restrictions, others are fine forever.  There's no way to align or consolidate them either...I have a spreadsheet with them all...of course, that's also password protected....