Hi Paul,
I'm not sure I follow your question exactly. When you say the task
"disappears" what do you mean? Does the task name appear but the task bar
disappears from your view? This is most likely do to the option "Autolink
inserted or moved tasks" from the Schedule tab of the Tools > Options dialog
box. I suggest disabling that option. When you insert a task between two
tasks that are linked in a Finish to Start relationship, the newly inserted
tasks is automatically linked in a F to S relationship.
You are correct, projects are sorted by ID, but if you insert the task it
should update the ID numbers of all other tasks. Could you please explain
further what you mean perhaps we can be more help.
I hope this helps. Let us know how you get along.
Julie