What's up with my mouse?

I opened an old drawing and I have preset aliases, I pressed "L" and with ortho set on I drug my line 19.25 inches. and left clicked and nothing happened. The command line showed 19.25 but there is no line. All layers are turned on. this is what I did :

Command: l

LINE Specify first point:

Specify next point or [undo]: 19.25

Specify next point or [undo]:

Command: la

LAYER

Command:

Command: L

LINE Specify first point:

Specify next point or [undo]: 19.25

Specify next point or [undo]: *Cancel*

As upi see I tried it and then because nothing happened I checked layers.

Is there a way that my mouse is no longer registering. I can click onto the end of a line and the first point of my line seems to be registering ok. the finishing of the command seems to be failing.

Ok also if I list and select a window around the line I thought I drew. It shows up .

When I lsit the line it shows it to be 78'1.390 wide

Ok I changed the thinkness to 0 and all is cool sorry guys

Now I went in and changed thickness to zero and the whole dwg dis

appeared now what

I undid the thickness command and the dwg returned When I list the lines in the original dwg there is no indication of thickness in the attributes of the dwg. When I list the new lines there is a thickness listed in the attributes of the list command. I don't know what has happened to the dwg, nor do I know how to fix it.

I think you want to toggle off SHOW LINE WEIGHTS. Shown turned on circled in image.