While entering line items on Bills i used to be able to use Control I to insert a line. Now Control I opens an invoice. How do i insert a line?

It's Control + Insert Key, not the "i" key.

Always look at the Edit menu, to see the options that apply, as a Reminder.

@Marcia11_2

Control + Insert key will Insert a line above the line where you clicked the mouse.

Ctl D = delete Transaction
Clt Delete key = delete Line
Ctl Insert key = insert Line
Ctl I = Create Invoice

Please see my Keyboard Shortcuts handout attached.