LaTeX symbol now looks fuzzy

Question

In a document of mine, I was using the following symbol and command:
newcommand{plus}{{textcircled{+}}}

At first, the symbol textcircled{+} looked normal and smooth like the rest of the math. Now I recompiled the .tex file and the symbol looks fuzzy (see the pic below). I get the same in another document and both in the internal PDF viewer and in like Adobe Acrobat Reader. I did not change packages or preferences, so I have no idea about what is causing this.
Any suggestions on how to get smoothness back?

daleif · Answer

From the log sniplet you posted we can see that you're using MikTeX. To keep sizes down, sadly, MikTeX use a metafont font as the default font. This font is not scalable, and thus at high resolution you see pixelations like you show here
You have two choices

install the cm-super package, this installs a vector version of the default font. It is also the default font in texlive
use the lmodern package. This font is similar to the standard CM font, but is a vector font. Though it might not have support for Russian

Additionally, next time please provide a full full but minimal example which others can copy and test for them self. Here we do not know which packages or class you're using.

LaTeX symbol now looks fuzzy

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