I don't know how to receive the 3% weekly airdrop.
I have claimed more than 10 btx on 10 September but I haven't received any free coins.
The wallet is almost always offline but it shouldn't be a problem I suppose.
I guess your BTX are in your own wallet?
Are there more than 10 on a single Address?
There have to be at least 10 BTX per address - some people have problems because they have for example 20 BTX in their wallet but then again they have just 2-7 BTX on each of their addresses.