Hi, I've had this a few times. For me it has been not committing to a purchase and switching between clients for PC, mobile and the webstore. I've managed to work out the solution for me, so hoping this might help others to reset it's state:
To continue with the purchase you can now go back to any of the store fronts. The end lesson is dont start the transaction and then cancel it as the CG servers don't seem to automatically timeout and clear the purchase status!
Unfortunately, I don't have a Windows machine, so the PC client is a non-starter for me.
I would think that fully uninstalling and reinstalling the clients on my two devices (Android phone and iPad), while also having no tabs open to the webstore would have had a similar effect, but that doesn't seem to be the case
