As the release notes are not on all point completely clear to me, can you tell if this release should also fix the Tintin freezing issue after each chapter?
Sadly, a fix for Tintin is unlikely to materialize in the foreseeable future. The game uses an anti-piracy program for the Wii called MetaFortress, which is specifically designed to prevent games from being played off of a USB device. It works by pinging the Wii's USB ports, and if it sees that USB 2.0 is enabled, it locks up. This isn't normally an issue since that game's IOS normally only supports USB 1.1, but nearly all cIOSes activate USB 2.0 and thus trip the anti-piracy. They pretty much
have to, as otherwise, they wouldn't be able to load
any games through USB at a reasonable speed.
There are a few other Wii games that use MetaFortress. Of them, Kirby's Return to Dreamland is the only one that currently works in USB Loader GX without issues, and even it wasn't working until very recently, when someone created a patch for it that disables the anti-piracy. However, creating anti-piracy patches is a painstaking endeavor that involves running the game in an emulator and examining and patching various values in memory until the anti-piracy is tricked into passing all of its checks.
In Kirby's case, nearly
1,400 memory addresses needed to be patched to satisfy MetaFortress. And memory addresses vary between regional releases of a game, meaning that this process needed to be repeated
two more times to cover all three releases. Since Kirby is a popular Nintendo franchise, getting this game working has obviously been a priority for the community for a long time, but for a licensed kids' game with a much smaller fanbase... not quite so much. Creating a patch for Tintin would require someone to have both the technical skills needed to do so and the willingness to pour a lot of time and effort into it. It goes without saying that not many such people exist.
For the time being, it
might be possible to bypass the MetaFortress protection by playing the game off of an SD card on a cIOS with USB 2.0 disabled, but
a) loading games through SD is slower and less reliable than through USB,
b) I don't know of any cIOSes that actually have USB 2.0 disabled, so you'd probably have to patch or otherwise modify an existing cIOS, and
c) I'm not even 100 percent sure this would actually work, since I've heard that MetaFortress does additional anti-piracy checks beyond just the USB one.
It's always possible that something might happen out of the blue to fix this problem, or that blackb0x might be able to find a workaround, but I wouldn't hold my breath if I were you.
I'm helping a guy who has a wii. On youtube the guys install a lot of cios/ios, it gets to be more than 30 wad files. I would like to know if this is really necessary. In addition to the d2x-cios package, base and slot 56(249) 57(250) 58(251), which cios does he really need to install on the wii?
You're right: it's not necessary. Absolutely
nobody should ever need that many cIOS slots. Admittedly, there do exist a few games that don't work on the latest d2x version and require old or obscure cIOS releases to work (such as many N64 Virtual Console games), but between just the four recommended d2x-v11 slots (base 38 on slot 248, base 56 on slot 249, base 57 on slot 250, and base 58 on slot 251), you should be covered in about 99 percent of all cases.