Hi Tim,
I have 3 servers running WP sites with WF, 1 updates ok, / 1 gives a white screen of death after update – fix is to delete the WF plug in folder, & 1 returns the inet_pton() error, again delete WF plug in and all back running.
All 3 servers are Windows.
The inet_pton() error is on a server running W2K3, [soon to be shut down ]. . .
The one that works after updating runs Helicon Ape, this may be a coincidence . . .
hope this is of help to you