>I am getting an error message that says something like ...
>
> Attempt to update a read only column failed ...
>
> I get this error in a few places but one is when trying to disable a
> trigger. This is on a table that doesn't have any computed fields.
>
> Is this a known issue? This all works when using versions 1 or 1.5

It seems you are trying to update context variable (old/new)
in after-trigger.

Ivan