So I thought I would try the manager in Chrome rather than Firefox, just to see if the results differed.
They didn’t, but instead of just showing blank thumbnails, Chrome at least displays the "broken image" icon (image attached).
By right clicking and copying the image URL on the broken image icon (where it is trying to generate the image thumbnail for the TV), I get this URL:
http://future.thefutureforward.com/~steady/connectors/system/phpthumb.php?h=150&w=150&src=images/WORKSTEAD_Home_Image_2000x1500_w.jpg&basePath=/home/steady/public_html/assets/&basePathRelative=0&baseUrl=assets/&baseUrlRelative=1&baseUrlPrependCheckSlash=1
Perhaps this will shed some light on the path being incorrect? I don’t really see what I need to change in the file system path settings based on this, but let me know if you do.
Thanks!