Good day Jean, i have the same problem.
First I couldn’t get my portfolio to work right (error404). When I deactivated the plugin WP RSS Aggregator Versie: 3.3.1, my portfolio worked ok again.
So I wanted to remove that version but with the same error as mentioned above. When will the next update be ready? And do I need to have the 3.3.1 version activated for it?
One more thing I found: when I opened my site by mobile phone and tried to read the RSS feed in the popup window, the window could not scroll.
I am very pleased to hear that the new version has thumbnail possibilities, I was looking for that for a while now 🙂 Hoping it will work out ok with my portfolio. Thank you!
