Midway has released a patch that updates your copy of Stranglehold to version 1.1. Read the more details for patch notes.
Stranglehold Patch 1.1 notes:
The animations of the menu items on the change resolution screen now correctly reset after changing resolutions.
The movement keys are remapped to the arrow keys, and you can now lean out from cover.
Many resolution bug fixes.
Fixed default keyboard layout to allow for the movement keys to be remapped to the arrow keys, you can now lean out from cover.