Thank you for using DaReactions, I’ll do my best to solve all issues.
The first one sounds like a bug, maybe there is an error creating files, can you access any sort of server error log? You should look for something like this:
Warning: fopen(.....): failed to open stream: Permission denied in
To the second question the answer is no, yet. I’ve never thought of a taxonomy-based filter.
If you send me more information I will try to help you with the bug, I will need as many information as possible to replicate the issue, like WordPress version, PHP version, type of server (Apache, Nginx, IIS), theme name and version, and a complete list of plugins.