I do not have a Mac, so i do not know if this is applicable to your situation, It sometimes happens that the communication between poser and zbrush is broken (for example when one of the two crashes in a GoZ operation).

In this case Poser can get confused and try to use the old info when you do GoZ again (after a restart).

This info is stored on WIndows in users/public/Pixologic in the GoZ folders. GoZApps/Poser has the links to poser, GoZBrush the last exported figure or props references, and GoZProjects/Default the actual GoZ files which are exchanged.

Look at the date/time stamp of the files. The latest ones are probably the ones which cause a problem. Make a backup of the folder and delete the latest ones (most likely in the GoZBrush folder). After that restart Poser. If you delete files in the GoZApps/Poser folder you might need to reconnect to poser again in ZB

Maybe this info puts you on the right track