MainStage 4.3 can't save concert

MainStage 4.3 can't save concert.

Mainstage autoupgraded to 4.3 and now I can't save any of my concerts. I keep getting "The document [my concert] could not be saved". Try using File > Concert > Consolidate to re-collect all Sampler Instruments into the concert".

I've tried "Consolidate", "Save as", copying and resaving, etc - and they all end up with the same error.

I verified all samples that are working fine. I only use the Multi-sample sampler and Sylenth1.


Any idea what's going on.

Is there any way to downgrade to 4.2 again? (I should have turned of autoupgrade)

Posted on Jul 5, 2026 2:40 AM

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Posted on Jul 31, 2026 4:51 AM

I discovered that I was using an mp3 file for my sample. So I converted it to a wave file and then used AUSampler. I am now able to save the file. Maybe using a wave file in Quick Sampler or Sampler would work as well.

17 replies

Aug 10, 2026 4:25 AM in response to onnerby

I looked into this a bit more - with my 4.2 saved concert with ANY samplers present, the file won't save, on latest sequoia or tahoe ( I have both os'es, on MB Air 2020 and MBP M5) with Mainstage 4.3, tested same file across both computers and OS versions.


It's possible to select the concert and 'export as set' - this can be imported again. But if we adjust concert level settings they're lost. I have a somewhat minimal reproducible.


I just about made it though a 3 hour set for a (paid and contracted) gig on Saturday, but I'm stuck without being able to update and amend the work. This is a serious issue and needs to be addressed by Apple. A minor issue in the corner of some feature might be understandable but an entire concert refusing to save appears to be a rushed job, lack of test coverage during shipping of the new version. It's completely unacceptable to automatically push broken versions of products we depend on automatically, without ability to roll back to previous, working, versions.


Do better and remedy this issue with urgency.

Aug 2, 2026 5:55 PM in response to onnerby

I'm having this same issue. I had a performance on June 13th and my Mainstage concert was working fine. I have another performance coming up next week so the other day I opened up the same project to make some edits. When I went to save the project I received the error message "The document could not be saved. Try using File> Concert > Consolidate to re_collect all Sampler Instruments into the concert. " After following this instruction the error message still pops up when I go to save. From what I am reading in this forum apparently it is because I am using Quick Sampler in my project. I spent a lot of time acquiring and pitching my samples correctly. Its going to be annoying to do this again using a different plugin. Unfortunately I don't have an older version of Mainstage saved on my computer and it looks like I never set up time machine on my computer so I cant revert back to Mainstage 4.2. This is soo annoying, unnecessary and unfortunate. I have a performance next week and I need to find a fix ASAP. I might have to switch to Abelton Live.

Aug 10, 2026 12:46 PM in response to ccaid432

Update on this: I have officially switched to Ableton Live. It was a bit of a learning curve but I was able to recreate my Mainstage set in Ableton. There is a level of relief now that I am working with a more reliable software. I've been wanting to learn Ableton for years. This Mainstage saving issue was the perfect excuse to get me to jump ship!

MainStage 4.3 can't save concert

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