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

Top-ranking reply

csldp03

Level 1

25 points

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.

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17 replies

Aug 4, 2026 9:52 AM in response to onnerby

I upgraded to Tahoe 26.6 last night just before going to bed, and lo and behold my concert saved just fine 😮

Aug 13, 2026 10:16 AM in response to onnerby

Well, after working for several days, the same issue is back, of course two days before a weekend of shows with two bands. I wonder if this issue is on Apple’s radar. I’ll try reporting again.

MainStage 4.3 can't save concert