Lines disappear when zooming in

Draftsight 2023 SP2 x64: When I use the mouse wheel to scroll to zoom in on a line that I've either drawn or offset, the line disappears. I can hover my mouse across where the line is and it will briefly appear, so I know it's there, it's just not visible when zoomed in close. View > Shade View > Flat (save, then opening file) to no avail. I've also tried the command line option setting 'perspective' to 1 (save, and reopen) then changing 'perspective' back to 0, again, to no avail. What else can I do to be able to see lines when I scroll/zoom in? Thanks.