SOLUTION FOUND!
Okay, to do this I needed to increase the memory limit from 32 to 64MB. If you do not know how to do this, I suggest googling “PHP memory_limit increase” or something similar, as it is not simple and there are several methods that work for some people and not for others. If all else fails, contact your host.
Since I had not deleted the other plugins, deactivating them clearly didn’t make a difference.
Good luck!