Ida pro decompiles the wrong result

I recently tried to decompile in ida pro 6.1 ida out puts the wrong result, for all I decompile the functions I only get this code:

int result; // eax@1
return result;

      

        
        
        
      

    

for all the functions I decompile instead of decompiling correctly it shows that for example:

int __cdecl sub_975BB0()
{
    int result; // eax@1
    return result;
}

      

        
        
        
      

    

and some of them have null output:

void __cdecl sub_975C50(int a1)
{
  ;
}

      

        
        
        
      

    

Interesting thing she worked with 2 days ago, but suddenly it works like this. I updated my installation of ida 6.1 but there were no differences. Thanks for the help ^^