> But I think I found a pattern in the problem. Using qint64, it only
> happens with 3d layers. With 2d layers, or converting layers 3d to 2d, it
> works ok.
>
>
I tested with the line with 2 vertices:

ORGANIZATION:
DIGIT DATE:
DIGIT NAME:   pedro
MAP NAME:
MAP DATE:     Mon Oct 19 22:50:09 2015
MAP SCALE:    1
OTHER INFO:
ZONE:         0
MAP THRESH:   0.000000
VERTI:
L  2 1
 24882.53560915 98945.88447038
 61983.02003822 107847.51076796
 1     1


converted to 3d (v.drape):

ORGANIZATION:
DIGIT DATE:
DIGIT NAME:   pedro
MAP NAME:
MAP DATE:     Mon Oct 19 22:50:09 2015
MAP SCALE:    1
OTHER INFO:
ZONE:         0
MAP THRESH:   0.000000
VERTI:
L  2 1
 24882.53560915 98945.88447038 460
 61983.02003822 107847.51076796 473
 1     1


and moving 1 vertex (the line disappears):

ORGANIZATION:
DIGIT DATE:
DIGIT NAME:   pedro
MAP NAME:
MAP DATE:     Mon Oct 19 22:50:09 2015
MAP SCALE:    1
OTHER INFO:
ZONE:         0
MAP THRESH:   0.000000
VERTI:
L  0 1
 1     1


Best regards,
Pedro
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