act_obj.c
------------------
function do_locate
around line 3143

find

      for( in_obj = obj; in_obj->in_obj; in_obj = in_obj->in_obj );

change that to

      for( in_obj = obj; in_obj->in_obj; in_obj = in_obj->in_obj )

function do_call
around line 3269

find

      for( in_obj = obj; in_obj->in_obj; in_obj = in_obj->in_obj );

change that to

      for( in_obj = obj; in_obj->in_obj; in_obj = in_obj->in_obj )

skills.c
-----------------
function check_duck
around line 4073

find

   if( !is_npc( victim ) && !victim->pcdata->learned[gsn_duck] > 0 )

change it to

   if( !is_npc( victim ) && victim->pcdata->learned[gsn_duck] <= 0 )

function check_block
around line 4095

find

   if( !is_npc( victim ) && !victim->pcdata->learned[gsn_block] > 0 )

change it to

   if( !is_npc( victim ) && victim->pcdata->learned[gsn_block] <= 0 )

function check_tumble
around line 4122

find

   if( !is_npc( victim ) && !victim->pcdata->learned[gsn_tumble] > 0 )

change it to

   if( !is_npc( victim ) && victim->pcdata->learned[gsn_tumble] <= 0 )