To resolve the 'MHS av' 'MHS av' problem edit the file PiMinerInfo.py ...

nano PiMinerInfo.py

Change line 143 which shows

      s2 = 'avg:%s' % self.hashrate(float(d['MHS av']))
      return [s1, s2]


to this

      if ('MHS av' in d):
            s2 = 'avg:%s' % self.hashrate(float(d['MHS av']))
      else:
            s2 = 'avg GHs:%s' % float(d['GHS av'])
      return [s1, s2]