Hello, thanks for your feedback! I'll move the tooltips in the next update and yay I'm aware for the links, some of them are not linked and this will be resolved with the next update too - that update should be deployed today or tomorrow!
Hello, I may have an idea of what's happening - are you trying to send less than 21 XLM to an account that has 0 XLM?
Accounts requires at least 20 XLM to exists, so if you are sending Lumens to a 0 account, you need to send at least 21 XLM
Can you confirm that's the case? Otherwise I'll have to look further about it
I will probably add a message on <20 XLM accounts to inform users about that!
Please note however that this limitation is not decided by BlackWallet but by the Stellar Foundation.