Unable to light portal with lava and fire

i used to be able to light a portal with lava and wood.
I have not been able to do so with the snapshot.
The configuration is as follows.
Lava not shown.
Two block empty space below wood in front portal frame. Lava flows into this hol

PPPP
P  P
PWWP
PPwP

from top (note: below the wood is a 1 deep hole for lava to flow into

PPPP
 WW
  L