Can't install new extensions, buttons missing

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I've just installed KNIME 3.3.1 on my Fedora 27 environment. Installation finished fine, but i've some problems with the options interfaces. 
For example, I tried to install a new extension and I've noticed that are missing the buttons at the right botton of the window.

As you can see from the picture above, I can't cofirm or cancel my action since buttons are missing.

Does anyone know how to fix this problem?

Thank you in advance

Best regards

Giordano

2

Ok, I found a way to fix this problem (check original post). 
Basically what I 've done is edit the knime.ini file and add 

--launcher.GTK_version 
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before the -vmargs line.

Restarting Knime, all buttons will be displayed.

I hope that this post will be useful for other users.

Regards

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