There's something weird with headings that can cause unfolding to fail. Headings can be folded with TAB refuse to unfold - they need Shift-TAB to see the contents. This is scary as it looks like content has been accidentally deleted whereas it's really just hidden. The TAB-cycling worked as expected in Org 9.1.9 for the following example but fails in 9.4. The example below illustrates the difficulties: * Block 1 - you can delete X to leave two empty lines and TAB on "Block 1" (or 1a) cycles as expected - GOOD! But if the last line isn't empty but has spaces: * Block 2 - deleting X (leaving empty line) and then Z to leave the last line with just a space (one or more) and heading will fold on TAB /but won't unfold/. Shift-Tab is needed. * Block 3 - the same symptoms as Block 2 but has a subtree to show "Folded/Children/Subtree" when Tab-cycling on level one heading. Cheers Giovanni =================== * Block 1 - OK Block 1 text ** Block 1a heading Block 1a content X X * BAD BLOCK 2 - Delete X & Z, then TAB WON'T UNFOLD Block 2 content X  Z * BAD BLOCK 3 - TAB WON'T UNFOLD   Block 2 content ** BAD BLOCK 3a    Block 3a content X  Z * Block 4 - OK The end