I have a post update callout process which I have attached to the
update event on the quote, order and invoice. Having attached the
process whenever I attempt to read an existing quote, order or invoice
or to save a new quote, order or invoice CRM presents its 'an error
has occurred please contact your system administrator' message.

Normally in this case I would check the event viewer but in this case
it is completely empty! The callout process as it's first action logs
a message to a file just so that I can monitor the progress and this
is not happening so it appears that the process is not being called.
Removing the process and all metabase entries to call it does not undo
the problem - CRM is now convinced that all updates will invoke a
callout and will crash. Other call out processes still work so there
is nothing wrong with the logic of the process but CRM will give me no
clue as to why it is crashing.

Does anyone have any suggestions for where, if anywhere, CRM might be
logging a reason for what it thinks is wrong?

TIA