LISPSYS system variable

[office]

In AutoCAD 2021 there is this LISPSYS system variable which is messing up the vlax-ldata.

If I open a previous version saved dwg(with my custom vlax-ldata saved in the dwg) in AutoCAD 2021 and the LISPSYS is set to 1 or 2, the vlax-ldata-list returns nil. If I set the LISPSYS to 0 and I restart the AutoCAD 2021 the vlax-ldata-list returns the saved data.

If my lisp code is running with the LISPSYS set to  1 or 2 and I save the dwg and I open it in AutoCAD 2018(for example), the vlax-ldata-list returns nil.

What the hack is the trick?

[cadffm]

Never tried to search a trick, just confirming:

https://forums.autodesk.com/t5/visual-lisp-autolisp-and-general/visual-studio-code-and-the-autolisp-...

[CodeDing]

Wow...

I couldn't imagine having an entire custom dictionary just completely deleted. Without warning or preparation.

Thank you for sharing that link.

[Anonymous]

Yeah, they have been deleting variables these last few versions and lisp files that used those variable need to be redone if you still want them to work.