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Unity 11 simulator returns 'PAT memory allocation' error..

Published date: 04 June 2018

Goals and Symptoms
Unity 11 simulator returns 'PAT memory allocation' error..

Facts and Change

Causes and Fixes
Unity returns 'PAT memory allocation error' when trying to run the simulator in Windows 10 build 1703.

This is a known issue that occurs in Windows 10 only after a Microsoft hotfix is installed.  The issue affects Unity 11, 11.1, 12 and 13.
Engineering has released hotfix HF0435420R for versions Unity 11.1, 12 and 13.  
Due to complications with the required merging of specific files, a hotfix will not be developed for Unity 11.  
It is recommended that the user upgrade to Unity 11.1, 12 or 13.

The workaround is to either
  • Use the PLC simulator on a windows 7, SP1 PC.
  • Use the  PLC simulator on  or virtual PC that has Windows 7, SP1.
  • Uninstall the Microsoft hotfix.

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