Unable to set PIN for account login

I'm having a problem setting up a PIN code to logon to Windows 8.1 and would appreciate some help please.

I've linked mine and my partners MS accounts to Windows and as we use password generated passwords consisting of random characters, numbers etc, it would be so much easier to just use a PIN to logon to the computer. However, every time I click the option to 'Add' under PIN in the Sign-in options page of PC Settings, nothing happens. The cursor busy icon flickers but no new menus or options appear and I'm ultimately unable to access the settings.

Could someone suggest a way to overcome this issue please?

I've tried logging off/on, rebooting and restart the credentials manager service but there's no change.

Thanks for any help.

More info...

After clicking Add on the sign-in options page, I'm seeing quite a few of the following errors logged in the Application log:
Faulting application name: CredentialUIBroker.exe, version: 6.3.9600.16384, time stamp: 0x5215f313
Faulting module name: DUI70.dll, version: 6.3.9600.17031, time stamp: 0x53086a1c
Exception code: 0xc0000005
Fault offset: 0x000000000000277d
Faulting process id: 0x110c
Faulting application start time: 0x01cf5b36ca94bed5
Faulting application path: C:\Windows\System32\CredentialUIBroker.exe
Faulting module path: C:\Windows\system32\DUI70.dll
Report Id: 084f9905-c72a-11e3-8270-c05ffa3ee80b
Faulting package full name:
Faulting package-relative application ID:

I've tried booting into Safe Mode with Networking and this time I see an error box appear.

It's not too helpful though.

Windows Security

Create a PIN
First, verify your account info.

Tthe server threw an exception.

After testing on a virtual machine, I worked out the problem was being caused by changing some settings in Windows 8 Manager 'Security' section. Undoing the changes didn't fix the issue. The only fix was system restore. Unfortunately for me, I had disabled SR on the laptop as I had planned to use Acronis to take weekly backups once I had finished setting everything up. I had to refresh the pc to overcome the issue.

Bit of an inconvenience but it's all resolved now and I'm able to set a pin.

Have also emailed the developer of Windows 8 Manager to request they look into the issue. I took a backup of the HKLM hive before applying any changes on the virtual machine and another backup afterwards and there's a 7MB difference between the two so the program is doing something incredibly screwy with the OS.

Note to self; keep System Restore enabled until I have another backup option running!