Thanks Mike, again your help is very appreciated. I see where my
problem lies now, although I'm not quite sure how I can correct it.

But in better news; I managed to get a background color selector
working today (under the options tab) and also figured out why I was
having trouble at certain zoom levels. It transpires a website that I
used to calibrate my tile cutting script had its facts wrong about
zoom levels. It was actually suprisngly hard to find a simple list of
pixel dimensions for each zoom level, so I ended up figuring it out
myself in excel using the pixels = 4^Zoom forumla. Here they are for
anyone searching;

Zoom level - Pixels^2
0 - 256
1 - 512
2 - 1024
3 - 2048
4 - 4096
5 - 8192
6 - 16384
7 - 32768
8 - 65536
9 - 131072
10 - 262144

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