Several bugs after migrating from EB 3.9

Hello,

So, I'm testing EB5 to check how i'll explain to my bloggers how it works, what changed, etc... And did this for a while. I'm now trying to migrate from EB 3.9 to EB 5.0.25. I used the launcher, and the update went well (Except a "Stor fail").

After updating, I removed ARRA Articles, a module I was using until now to display articles on my frontpage, and changed it for the new latest module blog post. So, after those first step, I got some problems :

1) Links are like : http://allreported.fr/component/easyblog/aliase?Itemid=101. Even with the SEO option "Simple" (http://yoursite.com/menu/title), they're like this, though the original link (With the right SEO) is working.
2) Articles are like there isn't any css on them, nor UTF-8 (Pic : http://i.imgur.com/4wDC9EZ.png). Probably because of the error I have on the bottom of the page :
Warning: require_once(/home/redtrack/public_html/allreported/administrator/components/com_easyblog/includes/gettable/gettable.php): failed to open stream: No such file or directory in /home/redtrack/public_html/allreported/administrator/components/com_easyblog/includes/easyblog.php on line 497
Fatal error: require_once(): Failed opening required '/home/redtrack/public_html/allreported/administrator/components/com_easyblog/includes/gettable/gettable.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/redtrack/public_html/allreported/administrator/components/com_easyblog/includes/easyblog.php on line 497
3) The module isn't responsive. Here is the result if I make my window smaller : http://i.imgur.com/VLc452I.png. Is there any option to make it responsive? It doesn't look like there is one on the module configuration

To add some context :
- I'm running on Joomla 3.4.4
- I used the launcher to run the update, since the script on EB 3.9 dashboard wasn't working
- I did the update, activated the latest blog module, then didn't change anything (Except its options)
- This website is a duplicate of my prod website (So it's a test website, where I try to reproduce what will happen on the prod website, to make sure it will not crash)

Thank you for your help