Fixed for V8C1h and above:
If you tick the fields,
"combine line strings"
"77 format"
the resulting genio file will not be correct. It is possible in most cases if you also tick
"combine only when needed"
that the problem will not occur. The fix for now is to either tick off either
"combine line strings"
"77 format"
If you must have these on, then there is no work around until V8 C1h is released