Hi jcl, many thanks for your reply.
I've tried setting the loadHistory period to 60, which doesn't seem to do anything in this case.
I've also tried specifying a start date and end date to cover many years, as well as just single years. Each time, the script says it's downloaded one hour and reports "Done!". The only bar file in the history folder with a size >1k is #SPY_2015. Deleting all the #SPY history files to start again doesn't help.
Multiple brokers give the same result. In each case, using metatrader I've manually verified the brokers will usually supply H1 data back to 2013, but Zorro just doesn't seem to fetch it.
Any other ideas?
Thanks again