Fatal Error in all pages, always

Hello Guys, i have this issue in every page and i need to refresh the page so many times to navigate.
i'm using Elgg 1.8.6 and this error message is making me crazy.
how can i solve this issue? i have to refresh the page so many times to post, add files and access admin page.

Fatal Error.

An unrecoverable error has occurred and has been logged. Contact the site administrator with the following information:

Exception #1340349309.


PS: sorry for my poor english..

Para os brasileiros:
esse erro aparece toda hora e tenho que ficar apertando F5 pra poder navegar. isso acontece em toda pagina e nao consegui solucionar o problema de forma alguma. ja tentei desabilitar todos os plugins e  ativar 1 por 1 e mesmo assim continuo com esse problema.
o que pode estar errado?