Twice in 2 days I've filed VFR flight plans only to have FSS unable to
find them when I called on radio after takeoff. One was filed through
Duats at 9PM for noon next day (and left at noon). The other was filed
with a briefer at Terre Haute at 10PM for 8AM next day (and left on
time).

In both cases I had to re-file over the radio.