Summary
In Sage 300 my insert key stopped working.
Cause
This issue is not a Sage 300 program problem, loss of functionality on the keyboard is due to a hardware change on your computer.
Resolution
Depending on your hardware you will need to search the internet for the keyboard strokes to lock and unlock insert key function.
For example on a Dell laptop, function key may need to be locked to use insert key. To lock you would press Fn and Esc simultaneously.