If you remember, The last 0.3.3 update, which brought lots of fixes, improved prediction algorithm and performance to Z launcher took the app build version to 0.3.3. But this updated build also caused some unexpected problems for some of the users, forcing Nokia to release a roll back update.
In case you are not prompted for the update, you can check for the update manually from the Z Launcher settings. You can update your app by going to “Preferences” on the Apps list page and selecting “Update”.
In case, you also want to join the pool of testers in future, you can try your luck by going to this page or by being in touch with them on Twitter
In case you want to discuss and share your experience of Z Launcher, head to our Z launcher Forum