Hi Duncan,
Render opitons set to Canada is because the default template used has those settings. Once you set a particular project to a new setting those will be retained when reopened but it is best to go through your settings and adjust them as needed, then save them to your custom template and use that as the 'default' open option.
I have things like precision set to 1/4" instead of the default 1/8"
I have auto save turned off. I've increased the list of recently used files to display, set background to new image etc.
Also by default the Ground Location setting is 1'. That is why some items are above the terrian. That is also why some items, especially in Landscape have the option to place by Location or Terrian. There are also other items that are assumed to be placed on tables and these are automatically higher than 1'.
All I can say about Rendering is it will not generate if you have a 'bad wall' drawn , etc. It will turn out looking bad if your camera is in the wall or piece of furniture. It will be a problem if you don't have Render to File checked.
Z