Mac OSX guys, who are having a problem.
Try this,
Create a new user with admin privilleges. A nice virgin account. You should have one set up anyway for troubleshooting.
Make sure ZB is in the normal app folder, (I don’t know if this matters or not). Then don’t forget to remove the ZappLinkData and ZappLink.zsc files from the ZappLink folder, which you can chuck away after you remove the pdf, and make sure they are in the Zplug folder.
Then select a .psd file (you might have to make one first) and get info then use the “open with” option and then “change all”
Then see how it works in the new account. If it works OK then you know the problem is within your home folder. Maybe a corrupted pref file or even a corrupted cache file.
If it doesn’t work then you know the problem is deeper. Maybe it’s a problem that OnyX can fix, you can try it for free.