OK, it was a new bug so thanks Ugin for reporting (and IgorB for mentioning it in another email). When adding fastpath, gg inadvertently got the "big endian/little endian" wrong.

On Wed, Dec 25, 2019 at 4:31 PM Phyllis Smith <phylsmith2017@gmail.com> wrote:

Thanks. The "default" button in the debian build of December 25 was
missing for some reason.

Actually this may be a new bug because changes were made to the color picker. I will have to test further so that the bug does not get propagated to the monthly builds.