Welcom Cave Guy!
The block is in the Block List, it is captured in your screenshot.
Your version 2.1.3 is not the latest stable release, but I don't know any issues in 2.1.3 of this kind.
So it may be that the block is empty. What happens when you edit the block? Is any content shown in the block editor?
Other possibility is the reference of the block. When a block is created, it has a reference point (0,0) too.
If the block was drawn far away of 0,0 in the block editor, the inserted block is offset by this distance too.
So after insert do Zoom all to see what happens. When the block's content is far in the off, the drawing will become very small and the block is visible somewhere on the border.
Edit the block and look at the cursor coordinates, are they far away from 0,0?
Then it can be a layer issue. If the layer of the block entities is not BY LAYER or BY BLOCK it could be, that the blocks entities are on an invisible layer. The INSERT for the block is placed on the visible layer, but the entities will not be visible because of that. You can check this in the block editor too.
When there is content in the block editor, use Properties tool to check and modify the entities Layer. Or check, that all layers are visible.
In the status bar you see the number of selected entities. Do Select all (CTRL a) before and after insert, does the number change?
Last idea, the Tool Option bar. When you are in Insert mode, there are fields in the Tool Options bar (above the drawing area) to enter Scale factor or Rotation angle. Maybe there are invalid values set, which prohibit the insertion or makes it very small or big.
If the Tool Options bar is disabled by accident, you can enable it somewhere in the menus. Don't remember the exact naming or location in 2.1.3, but I think it was Toolbars and it should have a checkable option Tool Options.
Armin
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