ViaCAD Pro 7 behaved very strange today.
I am curently drawing the whole plan of the Acto Tool and Cutter Grinder in 3D so that I can better see how everything fit together.

I was busy drawing the one outer dovetail. I first draw the side profile and then turned it into a #D object , 147 mm long. I had to drill 4 holes: with their centres 5mm, then 68. then 66 and then 8mm, starting from the left. The last one would be 8 mm from the right. 5 + 68 + 66 + 8 = 147.

To be able to work with the snap function I normally draw a line 5mm long from the left and snap the centre of the first circle to the endpoint of the 5mm line. The Circle diameter is 6mm, so the circle's edge should be 2mm fro the start. Now ways. the circle' edge was far over the start point. If have repeated it several times, but 5 + 68 + 66 + 8 was still about 16 mm short of 147mm.

In the end I made a solid primitive of five mm long as a snap reference to plot the first circle. That worked.

The next part, the problem did not re-occur.
Seems to me there was a memory leak or a bug perhaps?