lorenzen wrote:Why must layer 0 be on when editing a block ?
If this for some reason has to be so, why is it an option, why is it not just on automatically ??
This does not have to be so in general.
The most common problem with layers and blocks is:
1. every entity inside a block in on a layer
2. every block instance (insert) is also on a layer
If the layer of the block instance is '0' that means that those inserts are only visible if layer '0' is on, regardless of the layer the individual entities of the block are on.
If the individual entities inside the block are on layer '0', that means that those entities of the block instances are only visible if layer '0' is on. It also means that when editing the block, those entities of the block are only visible if layer '0' is on.
If you have troubles keeping track of what layers your block instances are on, you may want to just put all block instances on a particular layer, e.g. layer 'inserts' or layer '0' if you prefer.