Problem solved!!! Thanks to Arvixe... for Arvixe users: to solve the problem I explained before, there is a nice function in the administration panel ( cpanel ). Just go to cpanel>arvixe>applications paths>click to create php.ini At...

Anyway I discoverd ( as u said ) that also Arvixe allows only 10 connections at time... Now I don't pretend to have a great social network, but 10 connections are too few... I will look for another host... :/  

Yes Yes I contacted them, but maybe I should wait a bit for the answer. As soon as they reply, I will post their answer! :)

  @Chad0989 I did as u told me and I see that for the "directive" "output_buffering" I have a value 8000 for both Local and Master Value. Does it mean I could override the master value through the .htaccess...

@Chad0989 mmmm do u think that the fact i have the elgg application in a subdirectory of my host, could create problems? In this case i should try to move all the application in  my "www root directory"...    

Yes yes. Look, I added the line u told me in the .htaccess file in the root of the elgg framewrok. I also tried to add the php_value, but nothing happened. Thank you anyway. I will try to contact the arvixe support. Another question: can u suggest...

@Chad0989 Thanks for the answer!. I tried to add the line as u told me, but everytime I do it I obtain an Internal server Error. Is There anything else to do?  (If I try to deactivate the ajax, i can see "all the comments" on another page,...

@midkniht I checked the link and it points correctly to http://www.mysite.com/pg/river_comments/allcomments/?guid=174 Moreover, I didn't modify nothing cause I just downloaded the plugin and avtivated it.  As I said, the first time...