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I think I know what the problem is...

After test loading some other sample pointers and graphics that from my test_scripts directory I now believe the issue to be one of the display colormap. Again, this is for tomorrow!

5 mins later....

No, it wasn't the colormap. A pointer needs a mask. So, I loaded my test pointer into Gimp, added an alpha channel and resaved. It worked fine! (My original test pointer was simply a coloured square). 

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