I am finding that the thumbnails when clicked do not always play the video. It seems that if I change any setting in Tubepress it is then randomly either working or not working. My site has just one page and 2 posts. However I noticed that the URL changes to include a Tubepress reference as seen here. http://newsite.union...ubepress_page=1where as the actual page is http://newsite.unionvenezuelasociety.org. Could that be the issue? I don't think so, because other links are fine. I have tried get/post and different player options. I'm using chrome and safari on yosemite and WP 4.0.1.
I'm quite happy to upgrade to the paid version but I'm not sure that would resolve the issue. I tried the 4.1.0 beta but that only support 3 thumbnails. I also had some trouble spacing but i did that with some customer CCS as found in these forums.
I have also found that the shortcode does not work in the pagebuilder of my theme, but I think the theme is the issue there.