Shadow Dragon
 

Is it me, or is something wrong? I have Jaheira approach the shadow dragon and cast 'magic resistance' as per tried and true combat tactic recommendation. The spell seems to take, but then I can't target the dragon! With spell OR melee weapon! The target reticule stays 'greyed out' and the dragon no longer has ANY status circle,,,,not red, blue or green,,no circle at all. What am I doing wrong? I tried 5 times and this happens every time.TIA!