MatterControl 2.0 in Ubuntu 22.04 won't export models

[mmwellner]

Bug Report

Steps to Reproduce

1. Create a new model in MatterControl
2. Right click the model and select "Export"
3. Select the export file type and click "Export"

Expected Behavior
A file chooser window should appear so you can select the save location of the exported file.

Actual Behavior
The export window closes and nothing is exported.

I tried this on 2 computers running the same version of Linux. One computer previously worked using Ubuntu's aptitude version of mono, but after I updated mono using the instructions on the installation page, export stopped working.

$ mono --version
Mono JIT compiler version 6.8.0.105 (Debian 6.8.0.105+dfsg-3.2 Wed Jun 30 05:34:49 UTC 2021)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
	TLS:           __thread
	SIGSEGV:       altstack
	Notifications: epoll
	Architecture:  amd64
	Disabled:      none
	Misc:          softdebug 
	Interpreter:   yes
	LLVM:          supported, not enabled.
	Suspend:       hybrid
	GC:            sgen (concurrent by default)

MatterControl Build Number
(To find this, go to the MatterControl menu in the top left and click "About MatterControl")
2.19.10.10370

Ubuntu 22.04.2 64-bit
Printer Make/Model
Bambu X1C & Pulse XE