Solved it with putting this in the sql:
(IIf(Forms!frmLMBSearch!txtTitle.enabled=True,(tblLMB.Title) Like "*" & Forms!frmLMBSearch!txtTitle & "*")<>False)
Looks like I just needed (tblLMB.Title) in the iif statement \=
I'm not sure what the <>False is doing, but access automatically puts that...