As the attached LyX file shows, Branches with spaces in the names can be created, but after the LyX file has been closed and re-opened, such branches do not display correctly on screen as the part of the name after the space has been stripped off.
Strangely, the full branch name, including the part after the space, still appears in the Document Settings/Branches menu page.
Graeme
BranchNameProblems.lyx
Description: application/lyx