Bastien writes: > Let me know if it works for you, Hi! I tried a recent git snapshot (Fri May 30 19:28:04 2014 +0200) and performed some manual tests (1 to 5, see below). - in org-columns mode ("C-c C-x C-c"): - 1) PASS: org-columns-edit-value ("e") updates correctly the empty/whitespace string - in normal org-mode (i.e. not org-columns mode): - 2) PASS: org-set-property ("C-c C-x p") and org-set-property-and-value ("C-c C-x P") update correctly the empty/whitespace string - 3) FAIL: when using org-set-property or org-set-property-and-value interactively, tab autocompletion for the "Property: " prompt can't find the name of property X if the old value of X was an empty/whitespace string - 4) FAIL: org-delete-property ("M-x org-delete-property") commands skips/ignores a property name if the value is empty/whitespace string I think that commit 822dcfc881a5df3249fcecf4b7bc71ee9c321b92 addressed the tests 1) and 2) and they pass, so I'd say the commit is OK. The tests 3) and 4) pass if I use the following (naive, demonstrative-only, just-to-give-the-idea) patch: