Hi @fatherb,
This is Alyssa from support. Thanks for reaching out and letting us know about your concerns.
We’ve tested Stackable with Gutenberg version 3.4.0 and WordPress 4.9.8 and it’s working properly in our end, the blocks are showing in the menu. Kindly note as well that other blocks may be located inside the Common Blocks, Formatting and Layout Elements drop-down.
If the problem persists, it may be also possible that it happened in a particular setup or with another plugin activated. Hope that you can help us narrow down what’s causing the problem in your end.
You can temporarily deactivate other plugins that may be related to the issue and let us know if deactivating any of them fixed the issue, please provide us the plugin name and version then we can also test it in our end.
Thank you! ??
Cheers,
Alyssa