DevExpress and wPDF - wide grid won't convert properly

Hi guys,

I'm using DevExpress & wPDF to export grid to pdf.
When the grid is quite wide pdf export doesn't work as expected. All the cells appear to be blank. If grid is not wide it works just fine.
If I do CopmonentPrinter.Preview it displays report properly(see my code).
Any tips?

there's my code:
PDFPrinter.Filename := FileName;
if PDFProperties.Execute then
begin
ComponentPrinter.RebuildReport( nil);
//PDFPrinter.Filename := FileName;
PDFPrinter.Modes := [wpClipRectSupport,wpAlwaysHighResPDF];
res := Screen.PixelsPerInch;
// settings for A4 formatted page
//w := Round(21/2.54*res);
//h := Round(29.7/2.54*res);
WPDF_Start('secret','secret');
PDFPrinter.BeginDoc;
try
for I := 0 To ComponentPrinter.GetPageCount - 1 Do
begin
with ComponentPrinter.CurrentLink.RealPrinterPage Do
begin
w := MulDiv(PageSizePixels.X,res, 100);
h := MulDiv(PageSizePixels.Y,res, 100);
PDFPrinter.StartPage(w,h,res,res, 0);
ComponentPrinter.PaintPage(PDFPrinter.Canvas,I, Rect(0,0,w,h),PaintRectPixels);
//ComponentPrinter.PaintPage(PDFPrinter.Canvas,I, Rect(0,0,PageSizePixels.X, PageSizePixels.Y), PaintRectPixels);
ComponentPrinter.Preview(True,ComponentPrinter.CurrentLink);
end;
PDFPrinter.EndPage;
end;
finally
PDFPrinter.EndDoc;
end;
end;