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You are here: Home / AutoCAD / Some AutoCAD viewports turn off when reach certain numbers of viewports

Some AutoCAD viewports turn off when reach certain numbers of viewports

April 27, 2011 by Edwin Prakoso 25 Comments

Have you encounter this problem before? You have several viewports, and some viewports are just not showing the drawings. When you tried to turn it off, then back on, other viewport will have this problem.

disappearing viewports drawing

I don’t think this is a common problem. But I saw two people ask on the same day, the same problem on CAD Tutor Forum. So I want to share it with you here, just in case you have the problem in the future.

This behavior might be because you set MAXACTVP system variable too low. If you have MAXACTVP set to 8, then when you create the 9th viewport, one of existing viewport will turned off.

According to help file, MAXACTVP variable controls:

Sets the maximum number of viewports that can be active at one time in a layout.

Initial value for this variable is 64, which is the maximum value allowed. I don’t think we ever need to create more than 64 viewports in a layout, so is most situation, this value is acceptable. This value set for each drawing. So if you have this problem, more likely because you receive a DWG file and the value is set low for that file.

Note: This will not affect the drawing when you plot the sheet. All drawing will be plotted properly.

I’m not sure if this value was changed because a LISP program or intentionally changed by the user. Probably because performance issue? Have you ever change this system variable? Why did you do that?

About Edwin Prakoso

I work as a Solution Consultant in Datech Solutions, Tech Data Indonesia. I've been using AutoCAD since R14 and Revit since Revit Building 9. I occasionally write for AUGIWorld magazine and I am also active in Autodesk discussion forum. I'm a member of Autodesk Expert Elite, an appreciation for individuals who give contributions to the Autodesk community.
Connect with me on twitter or LinkedIn. If you want to have my new articles sent to your email inbox, you can subscribe to the newsletter.

Filed Under: AutoCAD Tagged With: viewport

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25 Comments
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Ryan
Ryan
2 years ago

Thank you Edwin,
That was the very issue I was having today. I appreciate you sharing your talents and knowledge with others.

1
Reply
Edwin Prakoso
Edwin Prakoso
Author
Reply to  Ryan
2 years ago

Thank you very much Ryan.
I’m glad that I can help!

0
Reply
Jeff Wehling
Jeff Wehling
3 years ago

I’m having the same problem in AutoCad 2019 C3D. Moving from folder to folder, then returning and the viewport is blank, with no way of getting it reset. I have Layer manager saves and viewport names saved, but they do not reset the viewport at all! It’s a real production killer! Has anyone found a solution to this really needed function?

0
Reply
Jeff Wehling
Jeff Wehling
Reply to  Jeff Wehling
3 years ago

By the way, in this case ‘MAXACTVP’ did not resolve this issue.

0
Reply
banarahu
banarahu
6 years ago

Thanks a lot… problem identified…

0
Reply
stephenie nash
stephenie nash
7 years ago

Thanks, so helpful.

0
Reply
Ann M
Ann M
9 years ago

Thank you so much!!!! I was going nuts trying to figure out what was wrong! :) :)

0
Reply
Stephe
Stephe
9 years ago

OMG! You just solved my problem. Hours of frustration have been erased from my memory with this post. Thank you!!!!!!!!

0
Reply
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