Avan Amalsad wrote to me today asking me if I could corroborate her observations and those of one of her clients, she works with Microdesk and specializes in Revit Structure. She was asking about that version but I had Revit Architecture open. The two applications share these features so if it happens in RST I expected it to happen in RAC, it did! Okay okay...what is it?
If you have a grid, column and framing layout and adjust the position of a grid by a value of around six inches or less (150mm) you'll find that the framing doesn't follow the grid.
If you change the spacing by a value greater than six inches (150mm) then it seems to wake up and follow the grid. If you keep changing it by small increments the framing may not wake up until you've move it enough that it does again. Odd foible. Avan's client says that they saw a larger increment of failure back in Revit 2009 so it is better now. I guess we have to define better loosely? I recorded a little video to demonstrate it to make it easier to see.