Here is some additional information that may help shed some light on the F8 omission problem just reported.
I loaded a prior backup dated 6 Feb 2006 which sorts normally. After that backup was created on that date as a precaution, I converted my Writelog contest log from the CQ160 contest from 28 and 29 January to an ADIF file using WL2DX4WIN.exe--a conversion app that includes State info in the ADIF. I then imported the ADIF into DX4WIN and have since added more QSO's in February. When the ADIF was imported, there was one QSO in the log that was later than the QSO's in the mported file, so the ADIF was not appended but inserted into the pre-existing DX4WIN log file. One would think that this should not make a difference--but perhaps it does. It may make sense to make a copy of this prior backup, reimport the CQ160 contest and see what happens. Garry, NI6T