[Scribus] Gradient causes horizontal line under text

[John Brown]

I have two layers:

Background - contains a coloured rectangle equal to page size
Design - contains a text frame.

The rectangle is filled with a vertical gradient with three stops.

For some reason, this causes a thin horizontal line to be drawn under the 
text. The line has the colour of the second gradient stop. How can I work 
around this?

I am using Version 1.3.3.9 with Ghostscript 8.60 on Windows XP.

I have attached the .sla file if anyone wants to try.

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