Hi, this might be a difficult one to replicate, but I am suspecting there might be a small issue with New Blog Templates and Permalinks.
I notices that some plugins need to have me save permalinks after creating the new plug to operate correctly.
Today I got a 'Request exceeds limit of redirects error' on uploading a blog (xml file) into a site created with NBT.
Some research into this error pointed at .htaccess however the solution was simply to re-save the permalink on the newly created blog, no redirect loop anymore.
Just put it out there in case others have seen this issue.