One of the trickier things noticed with Sparrow is the initial set up, and toggling using Tor network as a proxy.

For users who wish to maximize the privacy capabilities of the wallet, this setting is a good one to turn on. However, depending on the other settings in the computer, users consistently get error messages. This might be caused by the user's VPN setup, and other firewalls working on the system, whether default OS firewall, or an additional third party firewall.

Tor browser is also required to be running to be used as a proxy, and this is an easy thing to forget when starting up Sparrow.

Still, the combination of Samourai whirpool to Sparrow desktop is great.

Please let me know if you need any help, or to elaborate on any previous points.