Today I suddenly discovered and couple of blue lines, probably some leftovers from something. The problem is that I can’t delete them. What could have happened? Have they become orphen bits of something?
Upload the .skp file so we can take a look, or at least post a screen shot of the lines to get a working answer, couple of different things that could be going on.
The lines are blue? Even when not selected? Are any other lines blue in your model?
As suddenly as the appeared are they now gone. They were blue even thought they weren’t selected.
Perhaps a graphics card issue? Has there been a change of graphics driver recently?
I update my system continuously but if there has been an update to the graphics car I don’t know.
Could be, Windows is notouirius for updates whitch break working graphics drivers. If the problem comes back I suggest you download and install the latest driver from your graphics card manufacturors website. Don’t be fooled by Windows saying you’re up to date!