About the invention, the problem that caused such a mess was a wrong check made by the bazaar.
Actually to be able to invent a skill, there should be 2 requisites:
- You should know at least at 100% a top skill with power over 1000
- You should have at least at 100% the wisdom in the element where the skill above belongs to
For some reason, the bazaar checked only the second condition but not the first one. This means that a lot of heroes (me included) were able to buy an invention while they shouldn't. This caused something like a "half invention": we can say a skill without a name. When the first hero that actually had both the requisites, bought an invention, all the "half invented" skills became "full invented" with a wrong name.
The only way to correct the situation is to identify and delete all the "half invented" skills. Since these are the majority, I believe that most of the heroes that bought an invention, won't have their own skill (me included). The problem was that, in the end, they couldn't have invented any new skill, so their invention will be lost. But it is the only way to correct the error.