Code Xpert missing

Have have just moved from 10.1 to 10.6 today and the code Xpert tab has gone missing!

I am using Toad for Oracel Xpert with DBA admin module & SQL Optimizer

Any thoughts?

The sub-tab is gone from the Editor, but there is a button right on the Editor
that will send your code over to the CX window. Once you run it in the CX
window, there is a button to send the results back to the Editor.