I can't access large folders, WEIRD problem

[ArsT]

1. the problem occurs only with this specific site.. which means in other site all folders work, there is no problem at all

2. i have never had a problem entering any folder..
the site itself is fast to me and physically located even close to me, so it isn't a speed problem

3. there are no other users who suffer from the same problem ,so i'm getting really hopeless on this

if you could solve this problem i'd be more than grateful..
thanks,

ArsT