I have been doing some tests:
results:
Firefox added gallery to favorite folder 2013-07-26 without problems
Chrome added gallery to favorite folder 2013-07-26 without problems
IE added gallery to favorite folder 2013-07-26 without problems
Opera added gallery to favorite folder 2013-07-26 without problems
At least know we now it is not browser related. I also know that it has nothing to do with the amount of total favorites, I have checked some of the
users who have problems, and it goes from 19 favs to 5001 favs and they all have problems.
So I am asking all users who have problems adding galleries to their favorites, send me a screenshot of the failing process, because I absolutely can't reproduce the error.
Also include as much info as possible, browser, provider, popupblocker?, AND include the url of the gallery that you want to add to your favorites
send it to support@imagefap.com