CrossMarginTrading sets value of liquidationThresholdPercent in the constructor: liquidationThresholdPercent = 110; Isolated margin contracts declare but do not set the value of liquidationThresholdPercent.
Recommend setting the initial value for the liquidationThresholdPercent in Isolated margin contracts.
This makes function belowMaintenanceThreshold to always return true unless a value is set via function setLiquidationThresholdPercent. Comments indicate that the value should also be set to 110:
