Hi!
I’m new here.
Henk - Maybe you should try a factory reset of the Button+ if you haven’t already. The Wifi connection is retained so you don’t have to set it up a second time. After doing so you can then remove it from homey, and add it back to see if it makes a difference. I had an issue where one of the Bar module screens turned into white/black noise after adding it to Homey, and a factory reset fixed it.
Here’s a couple of suggestions I have for the Button+ Homey app after using it for a short while:
1 - Be able to configure the display module buttons similar to the bar modules with actions and text.
2 - Display “display configuration” entries on a single horizontal row, instead of having the header/top above the value/s.
3 - A refresh button within the configuration screen. I’ve had a couple of occasions where a button configuration was changed from an on/off-switch scenario to a dimmable scenario but the interface still showed the on/off options instead of the dimming percentage so I had to back out and go back in to see it.
4 - Is there a way to trigger a flow when a bar module button is pressed? I can’t seem to find it.
5 - Not sure if you solved it already but I saw mentions at the beginning of this thread about a suggestion to use long press in order to adjust brightness, but a difficult thing would be to determine if the action should dim up or down. Would it be possible to achieve this by long-pressing to dim down, and button press + long press to dim up? I guess it needs to introduce a short delay so the regular button press doesn’t fire accidentally, but it was just an idea. 
6 - Be able to translate true/false and other common values shown in the display configuration with custom equivalents. The most obvious use case would be language translation to achieve a single language shown on the display troughout all of the information shown there, instead of having a mixed language display.
7 - I tried to DHCP reserve an IP address for my Button+ and noticed that the old DHCP IP was still referenced in the Homey Button+ app, even after removing it/adding it again. As if it is hardcoded somewhere. Eventually I gave up and DHCP reserved the first IP address it had. It solved the problem but I would’ve wanted another address to rearrange them in a way that allows multiple units to follow an address pattern (192.168.0.10, …11, …12 etc)
8 - There doesn’t seem to be a way to adjust the main color within the Homey Button+ app. I’m still able to do it from the device web page but it would be neat to have it where “all” other settings gets modified.
9 - Once a button configuration or display configuration has been set, there doesn’t seem to be a way to remove it again. The blank default option disappear after setting it up for the first time. I can of course select a button/display config that has not been setup yet, but it would go live as soon as I do, and thus may show up on the device unintentionally.
10 - Be able to select multiple devices of the same type for a single button configuration. It would allow us to toggle more than one light source on/off for example, or dim them up or down.
And finally, thanks for all the hard work that has gone into this! It is greatly appreciated 
Edit: Spelling errors and a few more notes added.
