Hi, I have five user licenses for Directory Opus and I now use these with a couple of Surface Pro 4 and a Dell XPS 13 that all have high resolution screens and use DPI scaling of 200% when not connected to an external screen and when docked use either 100% scaling or 150% scaling (with a 5K display) (under Windows 10 x64). Whilst I can set-up Dopus to display ok (with some issues with certain parts of the interface) by setting stuff manually, when we switch DPI scaling dynamically (for instance dock the machine to an external display) it does not react well. Most other applications we have do this very neatly (as long as they are recent versions). This is proving very troublesome and whilst I am sure you may be aware of this pain I would like to formally report it and ask for a roadmap for full resolution. It certainly means that for now I could not consider wider use and definitely restricts the number of users to one for now (myself), I could not expect some other family member to cope with this!
I have a new notebook with a 15.4" 4K screen. I am glad to hear GPS is working on fixing the scaling capability.
Fortunately I can use the screen at 1080p.
You can use Opus at 4k already, it just requires some configuration and has some quirks that will be ironed out but don't generally stop anything being usable.
It certainly can be used, but I would say it is unusable (practically) in the situation where you use the in built screen at say 200% DPI and then dock to a screen that you use say 125% DPI, in this case it is not practical to have to manually change column widths, font sizes, icons, and other settings every time, only to have to change them back. Also of note is that the Windows 10 DPI scaling method is different to Windows 8.1 and that applications react differently on both, I have some that work fine on Windows 8.1 and not on Windows 10 and vice versa, fortunately all the important ones have already been fixed and I am migrating to all Windows 10 just for standardisation purposes despite all the issues within it.
Switching DPI without having to adjust your config is something that will be addressed. (You'll still need to reboot before things look perfect, but that is a Windows issue that applies across the whole OS.)