As scheduled – week passed and the new HostBill version is ready: 4.1.4 with multiple improvements and bug fixes is available for download.
What’s new:

Client signup captcha
Spambots now seem to attack even billing systems – there is no better way to prevent it than implementing captcha. By default new client signups require captcha confirmation (you can disable captcha field in Clients->Registration fields)

Client profile files
You can now upload files directly in client profile, so it can be accessible only by this client, or staff members visiting client profile.

Fixed invoice data
When using EU invoicing, you can prevent client details edits appearing on invoices by simply enabling one option in admin config. Learn more

BitPay.com payment gateway
BitCoin digital currency gains popularity, start accepting payments in BitCoins now with BitPay payment gateway for HostBill. Learn more.

Full changelog available at http://hostbillapp.com/changelog