Acrobat crashes during Request E-Signature specify where to sign

I have tried several times to use Request E-Signature, either through my Acrobat App or by logging into my account online.  Every time I get as far as 'Specify where to sign' and then I just sit and look a blue circle for ages.  

I have tried checking for updates, repairing the installation and even leaving the app running all evening waiting for it to specify where to sign but the only option is Ctrl Alt Delete and task manager to close the app.  

I have the Adobe for Enterprise Plan and so it should allow me to use this function.  

Please can I have some assistance to rectify this issue.

Thank you in advance