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I recently installed the 12.3 version of Mathematica and got a bad problem. When I want to run some Mathematica files written in the 12.1 version, the appearance of the Mathematica changes badly so that it makes a lot of trouble. For example, if I run the code

enter image description here

then it changes to

enter image description here

Could you please help me with how to figure this problem out and keep the appearance as before?

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    $\begingroup$ I've seen this many times before myself since I installed 12.3. I also have 12.3 and 12.2 and 12.1 on same PC. I could never figure why it happens, i.e why everything become bold and fonts change. I assumed it is due to sharing of files somewhere between different versions. I am on windows 10. I wonder if other see the same thing on the mac. $\endgroup$
    – Nasser
    Oct 27 '21 at 8:09
  • $\begingroup$ Yeah this has been driving me nuts. If you copy and paste one of these corrupted cells over itself, that repairs it. $\endgroup$
    – Chris K
    Oct 27 '21 at 14:34
  • $\begingroup$ @Nasser Yes, happens randomly on MacOS as well. $\endgroup$ Oct 27 '21 at 16:22
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I had similar problems when I instaled 12.3: cells in my notebook would suddenly change to a poorly-readable font which looks like above. Wolfram support suggested running the following command once as a "patch" until 13 is available:

CurrentValue[$FrontEnd, FrontEnd`FrontEndObjectFormat] = "Legacy"

This solved the problem for me.

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    $\begingroup$ Does "run once" mean once in a session, or once for all the time? $\endgroup$
    – Ruslan
    Oct 27 '21 at 21:23
  • $\begingroup$ @Ruslan I have not tested the above, but I am sure it must mean for all time. The command above must update the settings in option inspector and they are saved on disk. $\endgroup$
    – Nasser
    Oct 27 '21 at 22:55
  • $\begingroup$ Yes, execute it once to change the preference for this setting permanently. Remember to do it again if you reset the preferences. $\endgroup$
    – josh
    Oct 28 '21 at 11:42

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