Well, I decided to make another new UI for myself so I started from complete scratch. I honestly cannot remember if I had this issue in past versions but alas I am going to list anything I run into.
I will make a new edit to this post as I find issues with this version of OpenRDX. If anyone else finds issues please add to it if you are using this version of RDX as well.
1. I started by trying to make an action bar window. I had dropped the "Buttons" option into the larger window on the right and was presented with these two errors.
RDX: Window <preview> caused a paint error.
Extended info:
-----------
Pointer: table: 0000000036215F10
Identity: preview
Path: <unknown>
Error
--------
[string "local windowpath = "true";..."]:62: attempt to index upvalue 'btn' (a nil value)
RDX: Window <preview> caused a paint error.
Extended info:
-----------
Pointer: table: 0000000059B70C30
Identity: preview
Path: <unknown>
Error
--------
[string "local windowpath = "true";..."]:62: attempt to index upvalue 'btn' (a nil value)
If I select the base frame option above the buttons option in the same large window the error goes away and icons appear as I would expect them to normally in the preview window.