Am I the only person uses the official wallet at https://neowallet.cn/

I know it is not the best thing out there, but it is the wallet that neo team created, it is browser based and I can access my private key easily so that I can export my wallet into any other wallets out there.

However, I guess there is a bug claiming gas. Claim gas button does not work I suppose, that is why gas is generated buy seems unavailable. I have to export the private key to neon if I want to claim my gas. Does anybody know why this is happening? Is there a minimum gas amount to claim?