I have the following proc report in ODS PDF. As written, just=d does not work. It becomes as if just=r. However, if I comment out either of the break statements, just=d works as expected. Not so much an open issue as just bug identification. The extra break in there is solely to build in more white space into the report, but isn't necessary.
I'm a bit confused. You have all display variables, so the summarize on the BREAK statement is essentially not doing anything because there's nothing to summarize.
When I run equivalent code in SAS 9.2 and ODS PDF, I see the just=d working whether the BREAK statement is there or not.
If you feel you have found a bug, the best thing to do is open a ticket with Tech Support so they can test it in all current versions of SAS and report the problem to the developers.
The only difference between my code and yours is that I coded my DEFINE statements as:
define baseline / display style(column) = [just = d] 'Baseline';
define endpoint / display style(column) = [just = d] 'Endpoint';