Hi,
Welcome to SEBLOD.
You are getting "no result" because you need to create some users using SEBLOD first. The Super User you created your site with does not count, because it was created with the core Joomla! form, and not the SEBLOD one. Try going to the user manager, click "new" and click "user" in the modal popup, then try to add some users.
Regarding the "bugs" you referred to. I think this is specific in your case, because this is not a widely reported issue, nor is it a problem on my sites. I think you need to start with a fresh installation, as it's not advisable to uninstall SEBLOD and re-install it multiple times like you have. This may cause some things to break and it will be hard to debug exactly what the cause of your issue is.
Often you get the "template not found" error when you have gone in to a SEBLOD element (Form, List & search type) and toggled between the views too quickly, so that the view was not able to fully load. Simply go back in to your view, allow it to load, then click Save and it should resolve the issue.
Finally, I think you should check out some of our extensive manuals on achieving what you are trying to do.
Thanks,
James