2nd endings do not align over the barline when there is a TS in the 2nd time bar. When the start of the line is dragged, at a certain point, the far end of the line will extend over the next barline. If the 2nd time bar is at the end of a system, then this recreates the old problem of a little piece of line floating over the start of the new system
Like most people the music I create uses repeat endings. Many times I need custom endings such as 1.-3. or 4., which don't seem to exist in the default list of system lines. I can create them in a session and use them but the next time I launch Sibelius (7.5) they are gone. How do I save custom endings that I create across sessions?