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Does the hive needs to cache everything? It creates some css conflicts, by forcing cached css in the place of the changed one.

That's somehow odd, minification should preserve exactly the same file order of the non-minified version, so it should be exactly the same.
The only problem could be a but somewhere in the minification process.
Is it something in your custom.css that is triggering the conflicts or did you change the original file or both?

I've only added custom.css. No other css was touched. The hive thing was mostly visible on "a" tags, that were forced to have an ugly blue link colour. I have switched it off for now to observe behaviour.

Okay, now I have to go bed, in the weekend I'll try to have a look.
BTW... why this topic is in general discussions and not in support?

I think, because it needs to be moved 

I think it's here, because I was looking for a discussion about minifying the css. However as it turned out, it caused these issues