Drill Symbol limit exceeded - CircuitStudio 1.5

In the Outputs section make sure that beside generating the Gerber files you generate also the NC drill files. The NC drill files holds the drills data.

To make the PCB the manufacturer fab will need the following layers: Top Overlay, Top Solder, Top Layer, Bottom Overlay, Bottom Solder, Bottom Layer, Outline, Inner layers (if any), Mechanical layers (if you have some cutouts or the like) and the NC drill files (plated, non-plated holes).

I've gotten that warning too. It seems harmless.  OTOH when I look at the PCB hole report I see there's a lot of drill sizes that are "slightly" different and I try and reduce that, either by editing my library footprints or just forcing holes to be a common size (i.e. 1.00, 1.01, and 1.03 mm can all be 1.0 mm) from inside the dialog/report. I assume the fab house probably already deals with that but I would rather send as clean of project as possible.  As well as sometimes some of the oddball ones I find turn out to be not quite right.

YMMV

Brewster

Is the drill change in question with a buried via?