I have a bug, whereby manual joining of line points will fail (ie manual as described here https://therion.speleo.sk/wiki/tips?s[]=join#joining_scraps_together <https://therion.speleo.sk/wiki/tips?s%5b%5d=join#joining_scraps_together> ) The trigger is when one of the scraps has -flip horizontal set and the other does not. I have not tested flip vertical. Seems to occur whether :0, :end, :<point number> or :mark syntax is used. As an example, for extended elevation where the yellow scrap (s8) is drawn so that -flip = none, and the blue scrap (s3) is drawn so that -flip = horizontal With no joins in effect: Syntax used: join 3-s8topstring@Hawkes:0 3-s3topstring@Hawkes:end It looks like I have joined the wrong end of one of the lines, but I have not. But there is a workaround that is sometimes successful - specify the opposite end of the line in the flipped scrap, to that which you want. join 3-s8topstring@Hawkes:0 3-s3topstring@Hawkes:0 The above example has properly joined both the scraps (semi-automatic join of s8 and s3) and joined both the red lines using manual joins where the 'opposite end' of the lines in the flipped scrap has been specified. So I have made it work out OK in this example, but is a nasty workaround. I have tried defining marks for the points that I want to join, but this bug persists even if you define custom marks. Joining scraps is not affected though, join scrapflipnone scrapfliphorz will work just fine. In the example above, join 3-HawkesElevEXT-s8@Hawkes 3-HawkesElevEXT-s3@Hawkes produces a perfect join for the scrap walls, but as expected not of the internal lines. My hypothesis: When it comes to joining line points, the point numbering and point mark association is messed up (reversed?) when (at least?) one of the scraps has -flip horizontal set. Bruce