floating inverter output causing over circuit protection?
Since there was no motor connected, you know it had to be from 'shoot through' (high and low MOSFETs on simultaneously). 

A bit of a guess- the driver chip you are using is a bootstrap type that cannot drive the top MOSFET on at 100%- switching is required to charge the power supply. While there is UVLO protection on the high-side driver, it's possible there is some sequence of operations that can leave the gates powered long enough to trip the overcurrent protection. 

You can calculate whether the 10K will discharge the gate charge of the three particular MOSFETs you are using fast enough for the overcurrent trip to not operate. This may or may not be a problem in the application depending on the tolerance of the MOSFETs to such abuse.