So I created a modpack for my server, called ArcticZone (That's also the name of the server, wich is from Romania so don't struggle to understand what is written in the backround.). The modpack works really nice, except one thing: it has no icon!!
I went into the assets folder and there was no icon.png in there, even after I added a logo. I created one manually, but that didin't show up when I launched the modpack. The modpack is not ever using the default icon for vanilla minecraft but an icon minecraft used to use in the pre-alpha versions. And that's not the only problem. It doesn't even show the name of the modpack!
So yep, that's the problem:
By the way, link for the launcher is: http://www.technicpack.net/api/modpack/arcticzone-modpack