I am sure this is not very important because it is not a bug with Filter Forge, rather just a bug with the demo.
I have extended my trial and it has been working great. Today; however, I got a strange message when I opened a filter. A small message box appeared saying that I could look at filters with the basic version; however, if I wanted to be able to save a filter I would need to upgrade to a better version. It then had two options, 1 upgrade 2 continue. If I continue I am allowed to edit filters, but I can not save them in the conventional method. I have to rename the filter in order to save it.
The strange part of this is I started Filter Forging at 5 am today and everything was fine and it wasn't until about 3 hours later that I started getting this message. So I have a lot of duplicate file names in efforts to try and create new filters.