I just did testing with PE and Poser 12.276 and have no problems. I have my poser Program and content located on my E drive so don't run into any permissions issues with Poser not finding things. If you are having to locate all the items you listed you may have an issue with folder permissions, or the folder not being found right away. Does the locate message happen with all your content?

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13