Long-standing bug, probably occulted by the fact the AI rarely casts Grip of Winter since it requires Water Archmage.
https://forums.elementalgame.com/448812/page/1/#0
Although I haven't really done extensive testing, this seems to fix it (Allows you to dispel the curse and restore the Build/Train buttons):
<GameModifier>
<ModType>Player</ModType>
<Attribute>DisableTraining</Attribute>
<Duration>-1</Duration>
<PerTurn>1</PerTurn><!--Added-->
</GameModifier>
<GameModifier>
<ModType>Player</ModType>
<Attribute>DisableBuilding</Attribute>
<Duration>-1</Duration>
<PerTurn>1</PerTurn><!--Added-->
</GameModifier>
<GameModifier>
<ModType>Player</ModType>
<Attribute>TotalHarvestMultiplier</Attribute>
<Duration>-1</Duration>
<PerTurn>1</PerTurn><!--Added-->
<Value>0.5</Value>
</GameModifier>
<GameModifier>
<ModType>City</ModType>
<Duration>-1</Duration>
<PerTurn>1</PerTurn><!--Added-->
<Effect>E_GripofWinter_Particle</Effect>
</GameModifier>
As a side note, I don't think the spell does anything to the AI: it just keeps building/training as if I hadn't cast it.
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