Hi, i’ve been trying to use ZApplink3 in ZB3.1 with Photoshop CS4 and i can’t seem to get it to work. When i drop the tool the dialog saying “Retrieving AppLink” appears but no document appears in PS. if i click back i get the usual dialog asking me to either return to ZB or the external editor. either way, i can’t get the usual document in PS. does ZApplink3 not support PS CS4? do i need to get and install CS3 or earlier? thanks!
I just tried using ZB 3.1 with CS4 Photoshop 64 bit for the first time and everything was fine.
Try resetting the Photoshop exe.
i’m not sure i know what you mean by resetting the PS exe…do you mean reinstall?
found the answer here: http://www.zbrushcentral.com/zbc/showthread.php?t=64806&highlight=zapplink+cs4
…just needed to set zbrush3 to run as administrator…how annoying! 
thanks for the reply and sorry for duplicating a question!