Fleksy has posted an update of their Messenger app, which seems much improved. I was one who only got the blank contacts screen, and I can now use the app. It opens to an Inbox screen, which makes it easy to reply to recent texts. You can see the names of your last nine texted contacts (why nine???), and it also shows the last 10 texts with those people.There is a search function, behind a Compose function (type in the name and hit search), so you don't have to scroll through all your contacts. It still seems to show all numbers for a contact, rather than just mobile numbers, and it doesn't identity which are mobile. But for me it's a huge improvement.
Just FYI: My first attempt to simply update failed, so I unstalled Fleksy, rebooted phone and watch, and install went smoothly after that.