Dpreview-cookie-behaviour-endless story-FF only

dpreview.com is THE main photo/videosite. Owned by amazon one could imagine only that there must be a real tricky cookie-system installed in firefox to please all the advertisers.
The problem with it is that there are two sections for a login.
Login only needed if one wants to participate/write.
1. in the forums. no problem at all
2. in the news
I could never login
Also after new board-system had been installed. Same problem.

I executed the steps given to have control over super/zoombiecookies and had these Addons installed.
only the first two were new:
Better Privacy
Ghostery
Only lately i have read the instructions how to protect the lso-entry in better privacy. but i do not yet understand the two setting, deletin flashcookies at the end and installation of flashcookies in FF-menue.

I understand ghostery but this didnt help for my problem.
noscript
febe

What i have found out is this:
a) sometimes i could even not logout from the forum-login(right-side)
one or two main cookies were blocked(noscript)
b) no login in the news-the ads above could not be seen.

This problem could easily be solved by a FF-reset, deactivating the addons.
FF says deactivating but in reality the are removed.
I have spent several week checking out the cookie-mechanisme on my winxp-system.
I have multiple hdds, some of them are copies. systempartition-copies.

login worked and i protected the LSO-entry as advised in p.4 in FAQ of better privacy.
but when ghostery was installed and all boxes checked. sooner or later no login was possible again in dpreview-news-left side.
deleting cookies in FF did not help, only resetting FF did.
I have now ghostery removed and will check the behaviour.
I was unable to find out what is really blocking this login.
maybe its a complicated mechanisme which does not allow blocking any cookie if one wants to login in the news.
I have just been reading through this thread about privacy.
FireFox, Top Security/Privacy Extension
https://www.wilderssecurity.com/showthread.php?t=329939
Thank you for your attention.
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the whole problem started first when i wanted to display the java/javascript-based
new htm5stereoviewer hereno plugins needed)
http://www.dddphotography.com/Macro/
klick on one if the images/thumbs
http://www.dddphotography.com/Macro/MacroGallery.htm?id=1
At the moment i cannot see the 3dstereo-images.
SOLUTION. Firefox reset as mentioned above.
since this is a break through in 3dstereo-photography(still images) it is important to know the mechanisme.
avoiding a Firefox-reset.