Hey @ralla,
Thanks for giving Flywheel a try! I’m personally not running into any issues connecting to my test site’s database on 5.0.6, and Adminer access was re-introduced about a month ago. I’ve asked the dev team and they are not aware of any bugs with Adminer usage.
Can you provide the full local logs for us? If you are unaware on how to grab those, we have a handy guide here: How do I retrieve Local's log file?
Thanks!