In Toad 10.6, I press the F4 button to do a describe for a package in the Schema Browser or the Editor. When the describe window comes up I am no longer able to toggle between the spec and package body.
In 10.6, the 'Toggle Spec/Body' button is there but more obscure. The button is at the far right and it is now the same color as the window background. See screen shot '855896.jpg.'
