Thanks for the update and file.
1. If I export the Y-Size of my Sash to Mullion Joint Segment it returns a slightly off value. It is 7/8" in the Y direction but returns 22.224655mm instead of 22.225mm.
I think the problem here is that Max's accuracy is set to display only 3 decimal places whereas RailClone's arithmetic operator is able to display more. Increasing Max's precision reveals that actually the piece isn't exactly 22.225mm.
Although they are still very slightly different I don't think it's enough to account for the alignment issue. Instead I think the spacing problem may actually be caused by a bug
in RailClone that is preventing an exported attribute from being read unless is is the first node attached to the arithmetic operator. We apologise for this and hopefully it will be fixed in the next update. In the meantime you can get around this by breaking up the equation across a couple of operators (see attached)
2.For some reason my Sequence Operator places a Sash To Mullion Joint at the start of the Left Side when it is 2nd. Yours seems to work as it should I just can't track down why it does this.
This is to do with the way the segment counters are calculated behind the scenes. When you have corner but no bottom input the first row technically includes the corner. (although the actual geometry is substituted with the corner segment's). However, when you add a bottom segment the bottom row is not included and the Y counter starts with the first default row. With the bottom input added the sequence operator should behaves as you would expect.
Please take a look at the attached file which resolves these issues.
Thanks very much for the suggestions, they're always really appreciated and helpful. I've added your votes to our wishlist but you'll be pleased to know we are already looking at solutions for both these issues and hopefully we'll see some development in this area in a future update.
I hope that helps, please let me know if you any further questions.