Meta box not showing in front

Hi,

After the most recent update, my meta boxes arent’s working properly anymore. The meta box value I added before the update is showing correctly, but whenever I try to edit that, or add new ones, it just doesn’t save it.

So, I checked the code and noticed some changes (so I updated my code), but now I can’t seem to get the meta box to show in the front end. (Also, it also seems my prefix is stuck on the default ‘rw_*****’. When I try to change the prefix, and edit the id in the front end <?php echo rwmb_meta(‘otherprefix_titel’); ?>, it doesn’t work. But when I still use the default prefix <?php echo rwmb_meta(‘rw_titel’); ?> (even though I changed the prefix while declaring the meta boxes) it still works.

What is te catch here?
Thanks

https://wordpress.org/plugins/meta-box/