This may sound strange, but i found the cause of bug Case 732663, its the
inputField.Length>=2
On the script called fontios, line 70 in the repo project.

Did a bit of trial and error on the repo project to try narrow it down, removing or moving the inputfield length check stops the crash and everything works fine.
Removed/moved it on my main project and that now works fine too.
I have the same "inputField.Length>=2" on various other scripts and projects and they do not crash, so still needs investigating further.

Original (crashes)
[code=JavaScript]if(waited && inputField.length >= 2 )
{
if ((Event.current.type == EventType.keyDown && Event.current.character == "\n") || (GUILayout.Button("send", GUILayout.Width(35*heightScale), GUILayout.Height(35*heightScale)) ))
{
ApplyGlobalChatText("user 1" + ": " + inputField, 0);
inputField = "";
ButtonWait ();
}
}[/code]

Also crashed (moved input length check into if statement below)
[code=JavaScript]if(waited )
{
if ( inputField.length >= 2 && ((Event.current.type == EventType.keyDown && Event.current.character == "\n") || (GUILayout.Button("send", GUILayout.Width(35*heightScale), GUILayout.Height(35*heightScale)) )) )
{
ApplyGlobalChatText("user 1" + ": " + inputField, 0);
inputField = "";
ButtonWait ();
}
}[/code]

Does not crash (moved input check after button and keydown event)
[code=JavaScript]if(waited )
{
if (((Event.current.type == EventType.keyDown && Event.current.character == "\n") || (GUILayout.Button("send", GUILayout.Width(35*heightScale), GUILayout.Height(35*heightScale)) ))) && inputField.length >= 2)
{
ApplyGlobalChatText("user 1" + ": " + inputField, 0);
inputField = "";
ButtonWait ();
}
}[/code]

If you could pass this message and information on to those in charge of that area, hopefully it will shed some light on the matter.

:D this is my bug