(This took a long time to research, so I'm answering my own question, hoping to save others some time)

Let's say I have a file like this:

one by two is $\froc1{2}$

When I run M-x org-preview-latex-fragment, all I get is a white square indicating that something went wrong and in the *Messages* buffer the line:

Cannot find image file ‘/home/.../ltxpng/....png’

How can I view the error message?

  • If you replace the Orgmode LaTeX fragment system by texfrag you get a menu item sending you to the error message buffer and one that is sending you to the LaTeX log file.
    – Tobias
    Mar 2 '20 at 5:12

As suggested here https://stackoverflow.com/a/5291339/3014199 look for a file in /tmp something like /tmp/orgtex*.log.
That works on my linux machine at least.

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