Really nice module and nicely coded.
Cache file deleted. You'll not face any cache related problem anymore.
Once, many years ago, when this was a non-commercial module, it contained ONE link to my own site. It was not 'hidden away in the source code', but easy to find in the template, where anyone could delete it. I don't think that was unacceptable, it was common practice among developers at the time. It was long since removed when it became a commercial module.
JFusion is constantly worked on, updated and improved, but although there are frequent upgrades to this component it doesn't mean any extra work for you as site administrator as the JFusion component does all the work for you, it's basically just a one click update to upgrade this component to the latest version.
Support is excellent and fast and I would recommend using the JFusion component over any other forum integration solution.