Hello,
My thumbnails dissapears after server migration... everything works perfect but the thumbanils dont show up... the images still there if i click on white space of the thumbnail image show up in popup.

I install the Akeeba Admin Tools i do Fix permissions but still dont work...

the url site of one article with this plugin www.kiosystem.pt/website/index.php?option=com_content&view=article&id=101&Itemid=121&lang=pt

Can anyone help me?

I just visited your page and the thumbnails seem OK. Did you solve your issue?