ARCHICAD 19 has an interesting bug that has developed from [presumably] the introduction of the new reference and snap features. This can occasionally result in a low level of precision, where elements are just slightly off orthogonal.
Graphisofts recommendation on combatting this is to “click carefully”, which works. I have run into some cases where clicking carefully and moving precisely has still resulted in slightly imprecise modeling.
Thankfully James Murray and Link Ellis have developed a label that has helped me combat this issue and track down any model elements (walls and beams) that are off orthogonal, even to the nearest 1000th decimal point!
We now have their label in our library, it is called “Ortho Label Check 19” available in the label settings.
With a single click you can check the angle of any wall or beam in floor plan view and get an “ok” for walls that are modeled correctly or an angle increment for walls that are “slightly off”.
I ran a check on my entire model and tracked down each wall that was misaligned (only 2), and fixed them. I will be using this for project audits, and encourage others to use it as a self-audit, when you run up against walls that will not heal correctly in elevation/section.