ALL MY LINES IN MY 2D DRAWINGS NOW HAVE A 2" DEPTH (THICKNESS).
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If this is happening to newly-drawn objects, you must have somehow gotten your THICKNESS System Variable set to 2. Type THICKNESS and tell it to use 0, or type in (setvar 'thickness 0).
Are you running any custom-defined commands that could include a change of that setting? It's saved independently in each drawing, so if it happens to newly-drawn objects in existing drawings when you open them, and you haven't run any custom commands that might be setting that, then there must be something like an ACADDOC.LSP file containing something that is doing it for you. Look for the file location with (findfile "acaddoc.lsp"), and open it in Notepad and search for any reference to Thickness. Or in the APPLOAD dialog box, look at what's listed [if anything] in the Startup Suite contents, and if anything is there, investigate those files, too.
If, however, things in existing drawings that were not thick before are turning out to have thickness just by virtue of getting into the drawing, and it's not only newly-drawn things, then I don't have any ideas other than the possibility that someone is playing a prank on you. But if they are, it should be found by the investigation mentioned above -- it would presumably be something like a CHANGE or CHPROP command assigning a Thickness of 2 to everything in the drawing. It could also be done with AutoLisp code that would include something like (ssget "_X" ... ) to find everything, then any of a handful of ways it could force thickness on things. But the word "thickness" [in any case combination] should be in there somewhere to find.
Kent Cooper, AIA 
Hi,
I suggest to use QSELECT command as the image below settings
after finish previous command directly go and from Proprieties dialog (Ctrl+1) go to Thickness and change it. see below image
repeat previous action with Polylines to finish the issue.see attached CAD file.
Imad Habash
@Anonymous wrote:
I've attached a segment of one of my plans to show you. ....
I can't select EVERYTHING in all my files and change to 0. It's going to crash.
It turns out to be not everything. The A-FLOR-CASE Layer doesn't seem to have been affected, and the A-WALL-PATT Layer has some things with 2" thickness but some 0". Not that it solves your problem to know that.... But it makes some of my previous suppositions less likely.
I wouldn't think it would crash anything to just do:
CHPROP ALL [another Enter] T 0 [another Enter]
but of course you'd rather find out what's causing it, rather than fix it in every drawing you open.
Can you post some pre-existing drawing that you have not yet opened since you noticed this problem? If others open it and everything has 0 thickness, but you then [after posting it] open it and the problem is there, then it has to be something caused upon opening, by ACADDOC.lsp or a Startup-suite file or the like [another possibility I didn't think of before is a .MNL file].
Kent Cooper, AIA
@imadHabash wrote:
....
I suggest to use QSELECT command as the image below settings
....
repeat previous action with Polylines to finish the issue.see attached CAD file.
And also [in the case of the example drawing] with Circles, and potentially other kinds of things in other drawings....
The unfortunate thing is that you can't select multiple entity types at one shot in QSELECT by Thickness, but need to narrow it down to specific kinds separately. But you can find them all at once, with the FILTER command, or this way:
(sssetfirst nil (ssget "_X" '((39 . 2.0))))
then change the 2 in the Thickness slot in Properties to 0.
However, that's a workaround, and doesn't get to the cause of the problem as they described it. And if there may sometimes be anything with undesired thickness that isn't exactly 2 units, it won't find those.
Kent Cooper, AIA
>> but of course you'd rather find out what's causing it, rather than fix it in every drawing you open. <<
Yes i agree with you..knowing the reason is more important than finding a solution especially if there is a lot of infected drawings.
regards,
Imad Habash
@Anonymous wrote:
.... Now I'm scared to open more.
One last thing you might risk, since the posted drawing gives a means of comparison -- open that same drawing yourself, in which for us there are only the few nested Lines inside a Block definition that have thickness, and see whether, when you open it and before you do anything else in it, more things come out having thickness. If so, there's no question that it's being brought about in the process of opening, and is not initially inherent in the drawing [and therefore presumably wasn't already in other drawings you've had the problem with, before you opened them]. At least determining that would narrow down the possible causes.
Kent Cooper, AIA
@Anonymous wrote:
.... I'm attaching another old file for you to try and open. See how this one is. ....
That one has 1421 objects with thickness greater than 0 [found via FILTER]. Six Circles are at 2", and the rest are Lines and Polylines whose thickness varies. That suggests that it's not necessarily in the process of your opening it, unless you had actually opened it after this problem arose but presumably before you noticed it was happening. But you could test again by now opening it yourself, and see whether the number of things with greater-than-zero thickness is more than what I found.
As with your first drawing, there are also a lot of things without non-zero thickness [e.g. again the casework Layer].
Kent Cooper, AIA