Sikuli unable to work at Virtual Machine Session

I have a virtual machine where i have sikuli code schedule (task scheduler) to run every morning 6am.
When i mstsc to the that VM from my workstation i see that sikuli started but never moved to next step, i.e. it triggers at time but never finds UI elements and stays in hung state.

Infact, when i mstsc to same VM and kick the sikuli code and minimize the VM explorer window, the execution freezes .