yep.... it is eset... i just uninstalled it and it is now working. Funny though... absolutely no other programs have issues with it.
Unfortunately it looks like this may be something only ESET can fix as it is something they are doing.
Excluding wbcore.exe from it didn't seem to help here.
EDIT: I have found a way to make ESET happy.
Open the configuration window for ESET, click on the setup option.
Then under Computer you should see something called HIPS with a green dot and enabled next to it. Click on enabled and pick setup from the menu.
On the Advanced setup screen find the configure rules button and click it.
Then click new... at the bottom
Give the rule a name like WindowBlinds and set action to ALLOW.
Then on the source applications tab pick Add... and browse to the WindowBlinds directory and select wbcore.exe
As best I can tell you do not need to configure any of the permissions on the other tabs, but if this still does not work then just tick them all.
Then click ok on each of the dialogs and sign out.
When you sign back in you should find WindowBlinds 8 is now happy with ESET (or rather ESET is happy with WindowBlinds)
We will be contacting them to see if they can white list us as that's an unreasonable number of steps.
These steps are only required on Windows 8. Windows 7 users should not need to do that.