Hi Faunt,
While setting the point of a line, is there not even a tiny square? 8x8 pixels? The magnifying squares come up only when, e.g., the point of a line is clicked on.
What are the settings of the Camera Calibration Tag> Attribute Manger> Settings? What are the settings?
The typical option would be to delete the preferences: “Cinema 4D.prf” file, but yes, that creates some work to get everything back. I typically zip the prefs, then delete the original. So the old one can’t interfere, but I keep them in a different folder.
Perhaps check with the Support
https://www.maxon.net/en-us/support/how-can-we-help/
Let me know if you can share more information.
Cheers