Hello,
i did some extensive research on the internet r on the internet without getting any solution for now.
Everytime i start zapplink and start painting in Photoshop ( cs5) after a while ZB loses the link to PS ( the icon of zapplink in zbrush just disappears). So whatever changes i did in PS wont be imported into zbrush anymore, no matter what i do. No pick up dialog box as well.
I cant really tell why this is happening since sometimes it just randomly happens sometimes once i add a new layer or click on a filter in photoshop. Anyone experienced the same problem? Essencially the Zapplink bar in front of the ZB canvas just disappears.

I m using Zb4r3 on Mac but i remember having those problems on older versions on windows as well