Problems with extending lines

[Rubiconlwb]

This does not happen often but has happened to me a couple times. Occasionally when I extend lines to the intersection of another line, the extension is sometimes too long or occasionally not long enough, stopping short of the line. I can't see that I am doing anything different on these occasions. Does anybody know what could be happening?

[Rcnewcomb]

Does anybody know what could be happening?

Do you have Grid snapping on?

[Rubiconlwb]

I'm not sure if I had grid snapping on or not but it happened on several separate lines. I even had some lines that went past the intersecting line and some that were short of the line.

[4DThinker]

I've had trouble when what I wanted to extend a line to was part a group and there were other vectors nearby. Check to make sure the destination vectors isn't part of a group.