graphics not reacting properly

Hi there,

I was trying some contol driven geometry and discovered some graphic problems. (At least here on ABD update3).

Here a testcase: the first genetration of geometry is successful but then playing with sliders gives unwanted results.

Assigning 'OffsetAboveSurface = Height;' to solid1 even gives more unwanted trouble

transaction 1 modelChange 'Add baseCS, cs1'
{
    node User.Objects.baseCS Bentley.GC.NodeTypes.CoordinateSystem
    {
        Technique                 = 'AtModelOrigin';
        DGNModelName              = 'Design Model';
        SymbolSize                = 1;
        GraphLocation             = <auto> {40.0, 40.0, 0.0, 115.59};
    }
    node User.Objects.cs1 Bentley.GC.NodeTypes.CoordinateSystem
    {
        Technique                 = 'ByCartesianCoordinates';
        CoordinateSystem          = baseCS;
        XTranslation              = <free> 4.77462954680272;
        YTranslation              = <free> -2.11263502763131;
        ZTranslation              = <free> 3.88403542625826;
        GraphLocation             = <auto> {40.0, 195.59, 0.0, 155.87};
    }
}

transaction 2 modelChange 'Add DistX, DistY, NumX, NumY, Offset'
{
    node User.Objects.Offset Bentley.GC.NodeTypes.Slider
    {
        Technique                 = 'Default';
        Value                     = 0.5;
        Maximum                   = 1;
        Resolution                = 0.1;
        TickInterval              = 0.1;
        GraphLocation             = <auto> {314.0, 40.0, 0.0, 139.237};
    }
    node User.Objects.DistY Bentley.GC.NodeTypes.Slider
    {
        Technique                 = 'Default';
        Value                     = 5.48717948717949;
        Maximum                   = 20;
        Resolution                = 1;
        GraphLocation             = <auto> {314.0, 219.237, 0.0, 139.237};
    }
    node User.Objects.NumY Bentley.GC.NodeTypes.Slider
    {
        Technique                 = 'Default';
        Value                     = 5.53846153846154;
        Maximum                   = 20;
        Resolution                = 1;
        GraphLocation             = <auto> {314.0, 398.473, 0.0, 139.237};
    }
    node User.Objects.DistX Bentley.GC.NodeTypes.Slider
    {
        Technique                 = 'Default';
        Value                     = 5.48717948717949;
        Maximum                   = 20;
        Resolution                = 1;
        GraphLocation             = <auto> {314.0, 577.71, 0.0, 139.237};
    }
    node User.Objects.NumX Bentley.GC.NodeTypes.Slider
    {
        Technique                 = 'Default';
        Value                     = 5.53846153846154;
        Maximum                   = 20;
        Resolution                = 1;
        GraphLocation             = <auto> {314.0, 756.947, 0.0, 139.237};
    }
}

transaction 3 modelChange 'Add pt1'
{
    node User.Objects.pt1 Bentley.GC.NodeTypes.Point
    {
        Technique                 = 'ByCartesianCoordinates';
        CoordinateSystem          = cs1;
        XTranslation              = Series(0,NumX*DistX,DistX);
        YTranslation              = Series(0,NumY*DistY,DistY);
        ZTranslation              = 0;
        Replication               = ReplicationOption.AllCombinations;
        GraphLocation             = <auto> {588.0, 40.0, 0.0, 155.87};
    }
}

transaction 4 modelChange 'Add Heigth'
{
    node User.Objects.Heigth Bentley.GC.NodeTypes.Slider
    {
        Technique                 = 'Default';
        Value                     = 3.5;
        Maximum                   = 8;
        Resolution                = 0.5;
        TickInterval              = 0.2;
        GraphLocation             = <auto> {862.0, 40.0, 0.0, 139.237};
    }
}

transaction 5 modelChange 'Add polygon1, polygon2'
{
    node User.Objects.polygon1 Bentley.GC.NodeTypes.Polygon
    {
        Technique                 = 'ByVertices';
        VertexPoints              = {pt1[0][0],pt1[NumX][0],pt1[NumX][NumY],pt1[0][NumY]};
        GraphLocation             = <auto> {1136.0, 40.0, 0.0, 115.59};
    }
    node User.Objects.polygon2 Bentley.GC.NodeTypes.Polygon
    {
        Technique                 = 'Offset';
        PolygonToOffset           = polygon1;
        OffsetMethod              = OffsetMethod.ByDistance;
        OffsetPoint               = cs1;
        OffsetDistance            = -Offset;
        ConstructionsVisible      = true;
        IsConstruction            = true;
        GraphLocation             = <auto> {1136.0, 195.59, 0.0, 155.87};
    }
}

transaction 6 modelChange 'Add pt2'
{
    node User.Objects.pt2 Bentley.GC.NodeTypes.Point
    {
        Technique                 = 'ByCartesianCoordinates';
        CoordinateSystem          = {cs1};
        XTranslation              = Offset/2;
        YTranslation              = Offset/2;
        ZTranslation              = <free> 0.0;
        GraphLocation             = <auto> {1410.0, 40.0, 0.0, 155.87};
    }
}

transaction 7 modelChange 'Add bsplineSurface1, bsplineSurface3'
{
    node User.Objects.bsplineSurface1 Bentley.GC.NodeTypes.BSplineSurface
    {
        Technique                 = 'FromClosedCurve';
        ClosedCurve               = polygon1;
        GraphLocation             = <auto> {1684.0, 40.0, 0.0, 115.59};
    }
    node User.Objects.bsplineSurface3 Bentley.GC.NodeTypes.BSplineSurface
    {
        Technique                 = 'TrimByProjectedCurve';
        SurfaceToTrim             = bsplineSurface1;
        TrimCurve                 = polygon2;
        SelectorPoint             = pt2;
        GraphLocation             = <auto> {1684.0, 195.59, 0.0, 142.443};
    }
}

transaction 8 modelChange 'Add solid1'
{
    node User.Objects.solid1 Bentley.GC.NodeTypes.Solid
    {
        Technique                 = 'OffsetFromSurface';
        SurfaceToOffset           = bsplineSurface3;
        OffsetAboveSurface        = 3;
        OffsetBelowSurface        = 0;
        GraphLocation             = <auto> {1958.0, 40.0, 0.0, 142.443};
    }
}

Ingo