[Dx4win] "Grid Index out of Range" Error

[J. F. Samuels]

No one replied so will ask again:

I just created a new log to fool around with LOTW, and when I try to use
File>Import/Export, I get the above exception message.  I tried putting one
dummy QSO in, even with a grid, but still same message.  And, when  I reply
OK, the import/export box comes up without any filters. I tried merging my
log,
which worked OK, but still get the same error when trying to Import/Export.
I recall seeing this symptom in an old append, but can't find it and don't
remember what the solution was.

I'm running 6.03.7, Win XP Home.