Spent the entire morning trying to figure out what I was doing wrong, only to find that this seems to be a pretty major bug in the railing tool.
Issue:
Associative railings using panels and inner posts do not respect the "left offset from previous post" or any of the offsets for that matter. Nothing changes.
Workaround:
If you draw a static railing, everything works as it should and all offsets are respected.
I had created custom panels and needed to use the offset values in order to line everything up correctly for the staircase. However, with or without custom panels, this bug seems to be rampant. The moment I drew the railing statically everything started working as it should.
ArchiCAD 25 | Cinema 4D R23
12-Core Mac Pro (2 x 3.46 6-Core Xeon, 64GB DDR3)
OS X 11.2.3
AMD Sapphire Pulse Radeon 5700 XT (8gb)