Scottish referees say the recent and "ongoing trend of personal and unjust criticism" towards top officials is "unacceptable."
Hearts release defender Kevin McHattie, with the left-back leaving Tynecastle by mutual consent.
Hearts lodge an appeal against the red card shown to Callum Paterson in the 3-2 defeat to Hamilton Academical.
Cardiff City striker Rhys Healey signs for Scottish Premiership side Dundee on loan until January.
Wigan Athletic sign Bolton defender Andy Kellett, Newcastle striker Haris Vuckic and Partick defender Jack Hendry.
Wigan Athletic have signed defender Jack Hendry from Scottish Premiership side Partick Thistle for an undisclosed fee.
Fulham striker Adam Taggart and Reading midfielder Aaron Kuhl join Dundee United on loan until January.
Dundee United have signed Reading midfielder Aaron Kuhl on loan until January 2016, subject to international clearance.