You said your dev bottle was not tightly capped for 45 days. How full was the bottle? 3/4, 1/2, 1/4? Can make a difference. If the bottle was 1/2-1/4 and the air wasn't squeezed out, it could be toast.
Sjixxxy's suggestion of putting a strip of the film in a cup of developer is a good one. That will let you know for sure.