Error: Unauthorized action or expired link on YOURLS 1.9.1 with php 1.7.4

[tcsoft]

When trying to log in after enabling the plugin, the follow error is displayed.

Error
Unauthorized action or expired link

I'm setting up a new YOURLS v1.9.1 and trying to add this as the only plugin, but when I enable the plugin it works ok until you try and log in again.
Then you get the error.

I only have 1 user for administrator, editor and contributor.
I have made the three sample short urls be owned by the admin user via MySQL

No idea how to degug this. Any help greatly received.

[TechnoTrumpet]

I am having the same exact issue, same troubleshooting steps.

[tcsoft]

Bump

[rodwill]

Same issue here.