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Menu bar items not clickable + UI Scaling Issues on 4K laptop

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I'm tearing my hair out over issues regarding some UI scaling issues on Cinema 4D R21. I recently upgraded my laptop to a top of the range Dell XPS with UHD 4K screen, thinking it would be a great piece of kit for using Cinema and other graphics programs in.

However when I open Cinema, by default the UI icons / text / elements are miniscule - understandable, due to the 4K screen being such high resolution. However the mouse clicks on the menu bar don't even seem to register at all, I can click on the icons just below the menu bar, but when I do they open up as a full screen rather than drop down. Clicking anywhere in the viewport seems to snap my cursor right to the very top left of the window:


Hard to know exactly what the issue is here, at some point I managed to get the UI to be scaled okay and reactive to mouse clicks, on a secondary monitor (1900x1200 resolution), but couldn't ever get it to be properly functional on my laptop's main screen. After restarting the app at some point it now seemingly doens't want to play nicely on either screen again.

As i've seen mentioned elsewhere i've tried to play around with the various settings available under the "Compatibility" tab in the application's settings, trying to use various scaling overrides / toggles but these settings are confusing at best and nothing seems to work any more.


Any ideas, am I just destined to find it a buggy unusable mess on a 4K setup? Even dropping my laptop's res down to 1920x1080 doesn't seem to do the trick - the UI is a bit more reasonable scaled to a good size but the menu bar items still aren't clickable.

EDIT: Attaching my full specs in case that helps. All my drivers and software updates are up to date etc.


OS Name    Microsoft Windows 10 Home
Version    10.0.18363 Build 18363
Other OS Description     Not Available
OS Manufacturer    Microsoft Corporation
System Name    DESKTOP-9QC48JP
System Manufacturer    Dell Inc.
System Model    XPS 15 7590
System Type    x64-based PC
System SKU    0905
Processor    Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz, 2400 Mhz, 8 Core(s), 16 Logical Processor(s)
BIOS Version/Date    Dell Inc. 1.6.0, 06/02/2020

The screen has a touch interface too, wondering if that could somehow be a factor? 


Annotation 2020-05-12 174423.png


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Did you ever get this figured out? I just had the same thing happen. Bought a new LG 4k HDR screen and now my C4D is broke. Pleaassee help I'm going nuts over here. 

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It's interesting what you wrote. I have a 4K 27 "monitor and I have not observed any problems in R21 or S22. I additionally use Windows 150% scaling. Screenshot below.


This problem must be related to your configuration. I recommend that you report the problem on the MAXON website:




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Dear members, we are aware of few more bugs that are still present withing the theme.We just wanted to let you know that we are working to fix them as soon as possible.


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