It’s true that there is a very large number of system variables and settings that are not easy to find. One of those is the one that controls the limit of how many objects can be selected at the time.
Typically you would hear or notice something along these lines: "When I pick an item with the Properties task bar open, at the top I see "No Selection" even though the items on the screen shows as selected."
The problem here is that the Properties dialog recognizes objects, but users cannot change color, layer, etc. this way.
This is all because in AutoCAD there is a maximum number of entities that can be selected before the properties palette registers "No selection". There is a property limit system variable PROPOBJLIMIT that controls that. By default it is set to 25000. The upper limit is 32767 (2^15) (16-bit).
To set it please do following:
- In command line type PROPOBJLIMIT
- Set it to 25000 or higher
I hope this helps.