So a little system background before asking my question.
I am using Sharepoint 2013 with Nintex Workflow, I've created a List workflow along with the variables I require. Office Infopath 2013 is installed and validated that it can be used to open and edit Sharepoint forms for various lists etc.
I am trying to edit my workflow start form via Infopath since Nintex forms designer is not an available editing option within my environment. I open my workflow, select edit workflow, select workflow settings, click edit start form. From there I am only provided the option to edit the form from Infopath 2013. Once selected I am prompted to save my workflow, I briefly see the loading wheel and then nothing.
What might cause Infopath to not open the start for for editing?