Unable to View Data Properly in Variable Editor (R2025a, Monokai Scheme)

I have long configured MATLAB using the Monokai color scheme. I use Matlab schemer to import the scheme. After upgrading to R2025a, I noticed that in the Variable Editor the row background is displayed in alternating black and white, while the text color is always black. As a result, I can only read every other row of data (see below), which is extremely frustrating.

I would really appreciate a fix on this as I love this scheme. Thanks in advance!

Answer 1

[Umar]

Hi @Yuan,

I have been looking into your Variable Editor issue with the Monokai scheme in R2025a, and I think I've figured out what's happening here.

The core problem is that R2025a underwent a massive architectural overhaul where MathWorks moved the entire desktop environment from Java to WebGL and web technologies. The Variable Editor specifically got redesigned as part of this change. Unfortunately, this created a compatibility gap with tools like MATLAB Schemer, which works by modifying Java-based preference files.

What is happening in your case is that the new Variable Editor is trying to use alternating row backgrounds for readability, but it's not properly reading the text color settings from your imported Monokai scheme. So you're getting black text on both the white AND black backgrounds, making every other row completely unreadable.

Here's what I'd recommend:

First and most importantly, you should report this officially to MathWorks Technical Support. You can do this through the Home tab in MATLAB by going to Resources and clicking Request Support, or just visit their support page directly. Include your screenshots and mention you're using MATLAB Schemer to import Monokai. The more people report this, the faster it'll get fixed.

For immediate workarounds, you have a few options. The easiest is probably to use MATLAB's new built-in dark theme instead of importing Monokai. R2025a actually includes native dark and light themes now, which you can access through Settings, then MATLAB, then Appearance, then Colors. It won't look exactly like Monokai, but it should work properly with the Variable Editor since it's designed for the new architecture.

If you really want to stick with your custom colors, you could try manually adjusting them in the MATLAB Appearance Settings. Go to Settings, MATLAB, Appearance, Colors, and then look for Desktop tool colors. You might be able to manually configure things to avoid the black-on-black problem.

Another option is to temporarily switch color schemes when you need to use the Variable Editor. Keep Monokai for your coding work in the Editor, but switch to the default or light theme when you need to inspect data. Not ideal, I know, but it's functional.

You might also want to check if upgrading to R2025b helps. It was released as a stability and bug fix release building on R2025a, so there's a chance this issue has been addressed.

This isn't an isolated problem by the way. A lot of users have reported various UI issues with R2025a, particularly around color schemes and customizations that worked fine in previous versions. It's basically growing pains from the architectural transition. The Variable Editor text colors appear to be fixed now and can't be controlled the way they could be in older versions.

I know this is frustrating, especially when you've had your setup working perfectly for so long. But the good news is that this is clearly a bug on MathWorks' end, not something wrong with your configuration. Once you report it and they're aware of the issue, they should be able to fix it in a future update.

Hope this helps, and good luck getting this resolved!

[Yuan]

Hi @Umar, thank you so much for this detailed explanation. This is super helpful and I really appreciate it!

[Umar]

Hi @Yuan, You are very welcome! I am really glad the explanation was helpful.