LipidCreator Interactive Tutorials only work on Windows

[nilshoffmann]

When I run the latest LipidCreator build (https://github.com/lifs-tools/lipidcreator/actions/runs/767101082) or a locally built version and start an interactive Tutorial, e.g. the PRM Tutorial, LipidCreator crashes after I click on "Continue":

2021-04-20 14:32:06,947 [1] INFO  LipidCreator.LipidCreator - Running LipidCreator version 1.1.2.769 in standalone mode on Unix
2021-04-20 14:32:06,955 [1] INFO  LipidCreator.LipidCreator - Using /home/nilshoffmann/Downloads/LipidCreator(1)/LipidCreator as base directory for relative resource lookup. Resolved executing assembly location: /home/nilshoffmann/Downloads/LipidCreator(1)/LipidCreator/LipidCreator.exe
System.ArgumentException: A null reference or invalid value was found [GDI+ status: InvalidParameter]
  at System.Drawing.GDIPlus.CheckStatus (System.Drawing.Status status) [0x00098] in <345861cc94284a0bb0f2f2528d6cd247>:0 
  at System.Drawing.Graphics.DrawImage (System.Drawing.Image image, System.Int32 x, System.Int32 y, System.Int32 width, System.Int32 height) [0x00025] in <345861cc94284a0bb0f2f2528d6cd247>:0 
  at System.Drawing.Graphics.DrawImage (System.Drawing.Image image, System.Drawing.Rectangle rect) [0x0002c] in <345861cc94284a0bb0f2f2528d6cd247>:0 
  at (wrapper remoting-invoke-with-check) System.Drawing.Graphics.DrawImage(System.Drawing.Image,System.Drawing.Rectangle)
  at System.Windows.Forms.Control.DrawToBitmap (System.Drawing.Bitmap bitmap, System.Drawing.Rectangle targetBounds) [0x000f4] in <6d635ac3dc1c4424ad385ded79f1e868>:0 
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.Control.DrawToBitmap(System.Drawing.Bitmap,System.Drawing.Rectangle)
  at System.Windows.Forms.Control.DrawToBitmap (System.Drawing.Bitmap bitmap, System.Drawing.Rectangle targetBounds) [0x000c2] in <6d635ac3dc1c4424ad385ded79f1e868>:0 
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.Control.DrawToBitmap(System.Drawing.Bitmap,System.Drawing.Rectangle)
  at LipidCreator.Overlay.update (System.Drawing.Point location, System.String dir) [0x00106] in <3e436ff1f24d4c638595dddbede6f7c3>:0 
  at (wrapper remoting-invoke-with-check) LipidCreator.Overlay.update(System.Drawing.Point,string)
  at LipidCreator.Tutorial.TutorialSRMStep () [0x00287] in <3e436ff1f24d4c638595dddbede6f7c3>:0 
  at LipidCreator.Tutorial.nextTutorialStep (System.Boolean forward) [0x00039] in <3e436ff1f24d4c638595dddbede6f7c3>:0 
  at LipidCreator.TutorialWindow.nextTutorialWindow (System.Object sender, System.EventArgs e) [0x0000d] in <3e436ff1f24d4c638595dddbede6f7c3>:0 
  at System.Windows.Forms.Control.OnClick (System.EventArgs e) [0x00019] in <6d635ac3dc1c4424ad385ded79f1e868>:0 
  at System.Windows.Forms.Button.OnClick (System.EventArgs e) [0x00011] in <6d635ac3dc1c4424ad385ded79f1e868>:0 
  at System.Windows.Forms.ButtonBase.OnMouseUp (System.Windows.Forms.MouseEventArgs mevent) [0x00069] in <6d635ac3dc1c4424ad385ded79f1e868>:0 
  at System.Windows.Forms.Button.OnMouseUp (System.Windows.Forms.MouseEventArgs mevent) [0x00000] in <6d635ac3dc1c4424ad385ded79f1e868>:0 
  at System.Windows.Forms.Control.WmLButtonUp (System.Windows.Forms.Message& m) [0x00078] in <6d635ac3dc1c4424ad385ded79f1e868>:0 
  at System.Windows.Forms.Control.WndProc (System.Windows.Forms.Message& m) [0x001b4] in <6d635ac3dc1c4424ad385ded79f1e868>:0 
  at System.Windows.Forms.ButtonBase.WndProc (System.Windows.Forms.Message& m) [0x00037] in <6d635ac3dc1c4424ad385ded79f1e868>:0 
  at System.Windows.Forms.Button.WndProc (System.Windows.Forms.Message& m) [0x00000] in <6d635ac3dc1c4424ad385ded79f1e868>:0 
  at System.Windows.Forms.Control+ControlWindowTarget.OnMessage (System.Windows.Forms.Message& m) [0x00000] in <6d635ac3dc1c4424ad385ded79f1e868>:0 
  at System.Windows.Forms.Control+ControlNativeWindow.WndProc (System.Windows.Forms.Message& m) [0x0000b] in <6d635ac3dc1c4424ad385ded79f1e868>:0 
  at System.Windows.Forms.NativeWindow.WndProc (System.IntPtr hWnd, System.Windows.Forms.Msg msg, System.IntPtr wParam, System.IntPtr lParam) [0x00085] in <6d635ac3dc1c4424ad385ded79f1e868>:0 
2021-04-20 14:32:26,169 [1] INFO  LipidCreator.CreatorGUI - Closing LipidCreator!

This happens on Ubuntu 20.04 with the latest Mono version:

Mono JIT compiler version 6.12.0.122 (tarball Mon Feb 22 17:33:28 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:          yes(610)
	Suspend:       hybrid
	GC:            sgen (concurrent by default)