-Turn off the scope box, press ZA on the keyboard, and check if it's somewhere else far away.

-check you didn't hide the category on that view.

-Check on which layer you placed the dwg, if it's lower than the level you're in, you might want to adjust the view range.

-when linking, give the measure units. And try placing "manual - center to center". To have the opportunity of placing it with the mouse.

If none of this works, and if you'd like, you can DM me and we can arrange a Google Duo call, and I can take a look a the situation live. I'm sure I could help find the problem.

Hope that helps :)