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I’m having a rendering problem in Manjaro. I recently updated, and now the fonts are blurry. The volume and refresh icons in the right corner are also blurry, as are some toolbar icons. In the browser (Vivaldi), I have to disable hardware acceleration because if I enable it, it blurs all the fonts in the browser.
The question is: is there any solution for this? Is it related to the fonts? Is there a terminal command to fix this?
Thank you for your help.
If disabling hardware acceleration change the appearance it is related to the GPU driver in use.
I suggest you try
First a restart of your system (you may already have done this)
Then close all applications and remove the content of ~/.cache then do a user-space restart
systemctl soft-reboot
Please provide system information with inxi -zv8, formatted as code.
TLDR: you might be bitten by the mesa bug in case your GPU is intel pre 2011, as explained in the update announcement.
linux-aarhus: If I do this, will the system just restart? Or will it format itself? I’m asking because I have several files here.
I assure you that we won’t provide such dangerous commands. 
This is a UNIX system, not a Microsoft concoction. 
man systemctl
[...]
soft-reboot
Shut down and reboot userspace. This is equivalent to systemctl start soft-reboot.target --job-mode=replace-irreversibly --no-block. This command is asynchronous; it will return after the reboot operation is enqueued, without
waiting for it to complete.
This command honors --force and --when= in a similar way as halt.
This operation only reboots userspace, leaving the kernel running. See systemd-soft-reboot.service(8) for details.
If a new root file system has been set up on "/run/nextroot/", a soft-reboot will be performed when reboot is invoked, unless "SYSTEMCTL_SKIP_AUTO_SOFT_REBOOT=1" has been set.
Added in version 254.
[...]
The content of ~/.cache is just that - files that are cached by apps for reuse.
The cache used by an application which can use acceleration do so by compiling the gpu cache.
When an issue like yours put out it’s ugly head it may very well be that cache - thus removing it does no harm - it will be recreated by the application using it.
I don’t understand what you mean by will it format itself?
Not the whole system - just user-space - the idea is that if you can solve the issue by removing the cache and restart user-space - all good.
As you have not provided any system info … there is not much to suggest …
As @Teo points out - there is a rare case with old Intel iGPU - causing what you describe.
A conflict or race condition between GPU acceleration and compositor may also be worth investigating.
Hello @henriqueziemer and welcome to the Manjaro Community! 
@linux-aarhus is correct:
Could you provide the output of this Terminal command? (quick guide below):
inxi -zv8
Note that the output produced by this command is privacy-filtered.
Please also remember to use proper code formatting as this makes it much easier to read on the Forum:
Select and copy all the text in the Terminal window (minus the prompt, if you are using zsh).
Then paste the output in between two lines containing three backticks
```
or three tildes
~~~
Or:
Copy & paste, then highlight the pasted text and click the </> button at the top of the reply window (easier for smaller outputs).
Cheers!