ok, what have I got wrong? I had 10,000 on my wallet but now that is 0 again. Can you help me out?
Edit: Strange, now it is there again...! So another question: Why does it have to be fresh tangle attached? You can not use one adress for several transactions?
"Balance shows 0 sometimes" - This might be a wallet issue with the current version. I saw a similar issue raised on GitHub. They may fix it soon.
Receive address can be used multiple times but freshly tangle attached address is recommended for security reasons. Check out more here.