Hello,
Every time I try to modify an existing part sketch in an assembly I cannot create any arcs because as soon as I click the sketch endpoint it gives me the message "Please select an endpoint of a sketch segment", so I need to open the part, add the arc, then save the part and continue on. Is my Solidworks bugged, or is there something I'm doing wrong?
I've done some messing around and figured out that this only happens when I use a 3d sketch and only with the tangent arc while in an assembly. One of my coworkers has replicated this, so it looks like it's a limitation of Solidworks.