Strange behaviour of R graphics copied to PowerPoint

I have not seen this particular problem, but I have seen other problems and I tend to export bitmaps or pdf files as a result.

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Hello,

I am using R to create graphics, especially to plot time series charts.
These charts are then copied as metafiles (for best quality) to a
PowerPoint
presentation and then saved to PDF (via the "Save As" dialog").

Attached is two pictures. The first picture shows how my chart looks
like in
the R Graphics window, and the second picture shows how the chart
becomes
after saving it to PDF.

< http://r.789695.n4.nabble.com/file/n4668522/R.png>

< http://r.789695.n4.nabble.com/file/n4668522/Rppt.png>

As you can see. After saving the metafile to PDF via PowerPoint, some
straight lines appears (it seems like all of the lines has the same
origin
in the upper left corner and ends somewhere on the times series line).
This
happens in both plot() and ggplot(). The problem appears more often
when
using daily data in my time series. With monthly data the problem don't
exist.

Have anyone experienced this before? Do you think the problem is
related to
R or to Powerpoint?

Thanks all,

E

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