Hi Gordon,
I had a similar problems when I tried to use the examples and found some did not give good results. Could I suggest;
a) You try another example
b) Obvious i know but do make sure you have got the correct target start by checking at https://www.exoclock.space/database/planets. Clicking on the target in the list will give you the field of view. HAT-P-32b might be a good example as it has quite a large transit depth
Regards