Fixed 64bit bufferString bug

src/utils/strings.cpp

 
     text = new char[sz];
 
+    va_list copy;
+    va_copy(copy, args);
+
     n = vsnprintf(text, sz, string, args);
 
     if (n < 0) {
         sz = n + 1; // buffer too small
         delete [] text;
         text = new char[sz];
-        n = vsnprintf(text, sz, string, args);
+        n = vsnprintf(text, sz, string, copy);
     }
 
+    va_end(copy);
+
     return text;
 }