Can't select levels in linked structural model

[sjsl]

We have our structural model linked into arch model. It's been working fine up until today being able to tab select any element. Now, we can't even select the link. No d.o.'s in model, has it's own workset.

[dhurtubise]

Check at the bottom right is the select link element is turn on

[Craig_L]

check that the structural levels are set to shared, if they are not shared you cant do anything with them