Constant crashing on app open or opening .md file

scott.moser's Avatar


30 Sep, 2019 04:11 PM

I've used MMCv4 for a while now to help write lecture slides and it has always worked very well. But after the last upgrade (to Version 4.5.12 (104) ), the app is completely unusable. The app crashes when I create a New Document, when I try to open a file from within the app, and when I double-click a .md file from the desktop.

This occurs both on a MacBook Air laptop (from about 2016, running OS X10.16.11), as well as on my office Mac (running OS 10.16.??).

What happened to this once-good app?

  1. Support Staff 1 Posted by Fletcher on 30 Sep, 2019 07:01 PM

    Fletcher's Avatar

    I assume you don't mean macOS 10.16.11 (unless you have discovered time travel, in which case we definitely need to talk.)

    If you're talking about macOS 10.11, then there is an issue with 10.11 that causes the latest version of Composer to crash.

    You can still run the prior version if you restore it from a backup. Otherwise, I can send you another copy with instructions for how to copy your app store receipt to validate it.

    I can't maintain support for 10.11 indefinitely (it's now 4 years out of date), but my hope is to be able to restore 10.11 functionality for the current feature set, even if I have to drop support for 10.11 in a future update.


  2. 2 Posted by scott.moser on 30 Sep, 2019 07:35 PM

    scott.moser's Avatar


    Thanks SO MUCH for this!

    I'm sorry for my typo. My system is in fact OS 10.11.6
    So it seems I 'm a bit behind.

    So, could I *PLEASE* take you up on your offer for |"another copy with
    instructions for how to copy your app store receipt to validate it." for
    the older version?

    Thanks so much for your help, and your crazy-fast replies!


  3. 3 Posted by scott.moser on 03 Oct, 2019 07:39 PM

    scott.moser's Avatar

    THank you again for this. Time travel -- ha! Yes! If I could I would
    press pause and take a nap :)

    I upgraded from 10.11.6 to 10.12.6 on my office computer and the latest
    version of MMC works (or at least opens) fine with no problems. Im'
    'semi-update' my mac laptop now, but i expect similar results.

    Thanks again, and sorry for the bother.

    Just curious: what are your plans for MMC for the future? I ask because I
    recently started using Atom and pandoc for a lot of my markdown writing.
    But I still use your MMC to make Beamer slides. It is really great.

    Thanks again,

  4. Support Staff 4 Posted by Fletcher on 03 Oct, 2019 07:44 PM

    Fletcher's Avatar

    Glad it's working for you.

    I still plan on maintaining Composer for quite some time. There is a new version of the core text editing code which I am using in nvUltra (a successor to nvAlt with Brett Terpstra). The editing experience will be very similar between the two apps, but the feature set will be different. nvUltra is focused on large collections of short notes, where Composer is focused on writing longer documents (though can write short documents as well).

    I have some other ideas for some exciting new features that I am not quite ready to talk about yet as they need some more R&D time to prove that they work. These will be things that are appropriate for Composer but not nvUltra.

    I also have plans for an iOS app. I am not decided yet as to whether that will be Composer, nvUltra, or both.


    Fletcher T. Penney
    Manager, Founder
    MultiMarkdown Software, LLC
    [email blocked]

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