Tool pallets will show a lock symbol when the pallet is located in a folder that is 'read only' for that user.
The location of the source drawing might be specified using a drive letter mapped to a network location that isn't set for that user or is inaccessible.
AutoCAD may not know where to look.....
Options=>Support Files
Is the source drawing centrally located on a server?
There are advantages and disadvantages about a source drawing on a server. Everyone uses the same blocks, no exceptions. If a block is updated, it's updated for everyone, no discrimination. Any block added to, or deleted from, the source drawing affects everyone the same way. You need an internet connection, working remotely might be an issue., e.g., VPN connection. Two users editing the source drawing simultaneously might cause issues when neither one realizes someone else is in the source drawing making edits. i.e. who saves the changes first, who save the changes last? Which 'save' dominates?
Chicagolooper
