openssh-2.3.0p1-4 uses x11-ssh-askpass v1.1.0. This version of
x11-ssh-askpass contains a bug causing a '*inputTimeout: 0' to be
considered invalid, resulting in spurious error messages. Please
use x11-ssh-askpass v1.1.1, or regress to v1.0.3.
Doh! Must've missed the announcement (or perhaps got it confused with the one
for 1.1.0). Will be fixed in the next Raw Hide refresh. Thanks!