Rhino 5.5.5 crashes when I try to open Grasshopper (Mac)

Hi! I’m on my Mac and since installing MacOs Big Sur (11.1), I can’t use Grasshopper. When I try to launch it, Rhino crashes. This is part of the error it shows:

17:38:44.952: Grasshopper command executed

at MonoMac.AppKit.NSAlert.RunModal()
at System.Windows.Forms.MessageBoxForm.RunDialog()
at System.Windows.Forms.MessageBox.Show(System.String text, System.String caption, MessageBoxButtons buttons, MessageBoxIcon icon)
at Grasshopper.Instances.get_ComponentServer()
at Grasshopper.Plugin.Commands.ShowGrasshopperEditor(Boolean showUponLoad)
at Grasshopper.Plugin.Commands.Run_Grasshopper()
at GrasshopperPlugin.GrasshopperCommand.RunCommand(Rhino.RhinoDoc doc, RunMode mode)
at Rhino.Commands.Command.OnRunCommand(Int32 command_serial_number, Int32 doc_id, Int32 mode)
*** Terminating app due to uncaught exception ‘NSGenericException’, reason: ‘-[NSAlert runModal] may not be invoked inside of transaction begin/commit pair, or inside of transaction commit (usually this means it was invoked inside of a view’s -drawRect: method.)’
terminating with uncaught exception of type NSException
abort() called

How can I fix this?

Thank you!

The same thing happens when I try to open Preferences. It crashes Rhino

I am seeing the same thing with 5.5.5 crashing when trying to launch Preferences.


Sorry, Rhino 5.5.5 is not supported on macOS 11 (Big Sur) and won’t see another release. See https://www.rhino3d.com/5/system_requirements/ for the supported macOS versions. You can revert to your previous macOS build or upgrade Rhino for Mac to v7 which runs on Big Sur. Try the 90 day evaluation on https://www.rhino3d.com/download/rhino-for-mac/evaluation

1 Like

Dear Brian,

Is there truly no plans to fix this issue? I can understand no updates will be made to fix grasshopper (3rd party plugin) your basic “preference” command does not work. This is a very basic function I think asking users to buy an entirely new software is not a reasonable fix to such a fundamental problem. Rhino is not an affordable software. Please revisit with your team to see if this issue can be corrected.

Thank you


Big Sur is not a supported platform for Rhino for Mac 5.5.5


Sorry @jkim, no… Rhino 5 is no longer in development and the changes made by Apple to Big Sur caused Rhino 5 to no longer work fully. My understanding from the developers is that it would not be an easy thing or even possible for us to fix in Rhino 5 for Mac. Rhino 7 (and Rhino 6) runs on this new macOS though so if you own a Rhino 5 license you can upgrade it for much less. v6 and v7 licenses are also cross platform so you could use them on Mac or Windows and can store them in a Rhino Account to float the license between multiple computers.

Brian, it’s really disappointing that I can no longer use Rhino 5 for Mac since upgrading to Big Sur. I have the need to edit preferences but cannot do it, as it crashes every time.

Hard to believe that no fix is going to be offered.

Even with the discount, upgrading my EDU license to the commercial version, the fee is large cost for a freelance designer.

If there really is no plan for fixing Rhino 5, can any additional promos be offered?

The development tools needed for Rhino V5 have long since been retired.
There is no chance.

Here are the System Requirements for Rhino V5:

Mojave is the newest supported macOS.

Hi John,

I know Rhino 5 is not supported for Big Sur, I have already seen the literature stating such. I was hoping that the long term support would be a little better than this from McNeel. We are only talking about two versions back, not 10 years ago. I have tried the evaluation versions of Rhino 7 and it does not run as smooth as 5 on my older hardware, and I don’t have the need for the new features offered in 7.

For what it is worth, 2 Rhino versions ago is getting close to 10 years…

As alluded many times before: any fixes made to Rhino these days are going to Rhino 7. If you want to use those you’ll have to upgrade - in your case probably hardware, OS and software.

That said, since you’re still on Rhino 5, why not downgrade to Mojave as well? That should ensure a continued working of hardware and software in tandem.

Support is active even for pre-Rhino 5 version - for free.