I cannot see/edit/read my attachments :(

I cannot see/edit/read my attachments :(

Now I cannot see/read/edit my attachment files in Account Details. When I click on my attachment file there is new submenu appear (download/view in Zoho Write). If I chose "View in zoho Write" there is no happen. If I choose "Download" - appear new window "Unable to process your request Click here to go back." (browser line is "http://crm.zoho.com/crm/IAMSecurityError.do?isload=true")

But if I attachment new file - this file I can download successfully. 
Now I have not access to all my attachment files creare later.
Please, HELP!!!