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Edge of "shadow catcher" visible when using reflectance

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I'll try to describe this so I don't have to bother you with the files.


I'm compositing some extruded text onto an image of my desk.  I create a material with the image in the colour channel, and add it to a background, then position the text where I want it.


I then place a plane under the text and create a copy of the above material, and add it to the plane with a compositing tag.


Everything works fine, and I get the result I'm looking for, however, if I add reflectance to the material on the plane, to simulate reflections in the surface of my desk, the edges of the plane are visible.  The only way I've found to get around this is to make the plane larger that the whole image, so the edges aren't visible, but I'm sure I shouldn't have to, and if I want to add another object to catch shadows and reflections, a cup for example, I wouldn't be able to do this, so your help would be greatly appreciated.


I'm lighting the scene with GSG HDRI Studio Rig, using GI and AO in R20

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