Something

matthew@matt-laptop:~/svn/gimp/plug-ins/twain$ svn diff
Index: twain.c
===================================================================
--- twain.c     (revision 22743)
+++ twain.c     (working copy)
@@ -417,6 +417,7 @@
     /* Retrieve values from the last run...
      * Currently ignored
      */
+    g_message("Gimp running interactive!");
     gimp_get_data(PLUG_IN_NAME, &twainvals);
     break;
 
@@ -424,6 +425,7 @@
     /* Currently, we don't do non-interactive calls.
      * Bail if someone tries to call us non-interactively
      */
+    g_message("Running non-interactive!");
     values[0].data.d_status = GIMP_PDB_CALLING_ERROR;
     return;
 
@@ -431,10 +433,12 @@
     /* Retrieve values from the last run...
      * Currently ignored
      */
+    g_message("Running with last values!");
     gimp_get_data(PLUG_IN_NAME, &twainvals);
     break;
 
   default:
+    g_message("Into default!");
     break;
   } /* switch */