Hallo, I tried to change the value of org-agenda-block-separator variable to many things (including characters and strings, in accordance with the documentation) however I could not seem to achieve the desired result.
I was trying to make one blank line between agenda blocks in my custom agenda (defined via org-agenda-custom-commands). However I could only seem to either make two, or zero! :/ Searching for org-agenda-block-separator in org-agenda.el led me to org-agenda-prepare function, where it appears to me that there is no way to accomplish what I want, at least by simply changing a variable. Therefore I ended up commenting out one of the newlines in that function here in my local source, and re-loaded the file. And now I have one blank line between my agenda blocks, just as desired. :) But I thought this would be a good idea to bring to the attention of the mailing list. Cheers! TRS-80
