All new documents but thanks - clearing preferences resolve it :)

when open more then 9 artboards, illustrator make the same page number for some of the artbords (look at the video attached).
it open 1-9 artboads normally the next artboard is no 10 but 11 and also the one after it also 11 then until 14 it's also OK but then no 15 artboard but 2 16!
it make very hard to export the artboard that have the same page number
and generally really confusing

When I drag to copy an artboard it creates a new artboard. So when i try to export that new artboard it shows error and says it doesn't exist.

It also happens the new artboard to have number that already exists.

I am running into the same problem and I it doesn't work to export artboards that get stuck within the numbering glitch.

Same Problem here.

It was caused specifically when duplicating having more than one artboards selected using alt+drag with the artboard tool. When tried to export, it just exported the first one, ignoring the second.
As well, restarting the Illustrator fixed it.

Upon restarting Illustrator, file was fine.

I too am having this problem. But duplicating dartboards 15, 19, 28 and 32 out of 32 artboards. When exporting, only saves the second duplicate. Deleting duplicated artboards does not help.

https://adobe.ly/2FieEfr

I have this error too

I'm having a similar issue, I have two 15's and only one exports..

When I make extra artboards, sometimes the numbering doesn't work and it gives problems with exporting files.

See the file I included

1 Artboard 1
3 Artboard 3
3 Artboard 3
4 Artboard 4

Also there is no 18...18 is 19.....

Artboard 15 had been named 16 for quite sometime now, hadn't had a problem much except if you export 15 and 16 at the same time it would override "15" because it is 16

I created a new document and made up empty artboards and it still had the bug but restarting the application seemed to reset and it works now.

When creating multiple artboards the boards are given the same number i.e. two 15's or two 23's (see attached ) which means when you export to eps the artboards that have the same number are ignored.

When creating multiple artboards the boards are given the same number i.e. two 15's or two 23's (see attached ) which means when you export to eps the artboards that have the same number are ignored.

I got the same bug today.
I have made two new artboards, one has got number 46 (OK) and next happen to be 48 (47 is missing). If I try export range 46-48, AICC2018 says it's invalid. 46-47 is OK.
Bug stays after reopening file.
Here's the link for downloading both screenshot and file (with art removed):
http://dropmefiles.com/kxte3
Link will stay valid for two weeks.
(Uservoice, why can't I attach files in comments?)

Some Art boards are being missed out and re-numbered as a repeat of the previous number, see attached images

Hi Aidan,

Can you please share your AI file with me at nitiagar@adobe.com so that I can further look into the issue. Also, are you able to reproduce this issue with a new file?

Thanks & Regards
Nitish Agarwal
Illustrator Team

https://imgur.com/a/Q4hbN

I also have this issue. My document has 67 artboards, and number 27 is repeated (26 is omitted).