The developers are aware of these issues and problems in the game and are already fixing them! There is no need to contact technical support regarding these problems unless otherwise stated in the problem description. 

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General gameplay

ISSUE: Upgraded Haberdashery workshop does not count in quests
STATUS: Fixed

ISSUE: City name only changes after refreshing the game
STATUS: Being fixed  

ISSUE: The Christmas post office appears like an unfinished building
STATUS: Fixed

ISSUE: Buildings' tooltips do not reflect profit increase due to decorations, although the actual profits are adjusted correctly
STATUS: Being investigated

Islands

ISSUE: Amelia's helicopter timer starts automatically before the player opens missions
STATUS: Fixed 

ISSUE: Game freezes after completing 4 orders in Delivery Service on the Islands
STATUS: Being investigated

Expedition

ISSUE: The Window shows defeat instead of winning a duel in an expedition with the correct points 
STATUS: Being fixed 

Cellar event

ISSUE: The mouse/cat in the Cellar offers another task after the first one is completed (the reward for the first one is granted, but not visualized)
STATUS: Being investigated