Once or twice I (today especially) I have seen irradic mix behaviour as a result of inadvertently having it on.  Can anyone demonstrate what this feature is useful for?  From my point of view its like an automatic screw everything up button....  I already have one of those=-)

It is very useful when you need to make an overall adjustment without changing the automation shapes.
 
Dan

you mean if you need to turn the whole mix down kind of thing?

Exactly, but on a track by track basis.
 
Dan

Yes, it allows you to alter the values of all the nodes in the envelope without actually changing them. And their values all remain relative to each other. You can also select all the nodes in an envelope and then drag it up/down to change the values, but using the offset is much easier.

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Maybe try a different key binding for "Envelope/Offset Mode", so that it's more unlikely to inadvertently hit the specific combination of buttons.

FWIW, I use the caps-lock key on my keyboard for Offset Mode because it has a little LED which turns on when caps-lock is enabled.

Easy to see and therefore a helpful reminder. 

And yes, I too use and like this feature.
 

There is no key binding in Platinum. the only way to go into Offset mode is by the dedicated button in the Control Bar.*
 
OP, I use it when I've carefully crafted an envelope and find I need to raise or lower the whole track by a set dB value.
This is in the case where using the track input gain would upset the inputs into Dynamics processors
 

1. Engage Offset mode
2. Adjust fader
3. Go back to envelop Mode

If you engage it and leave it in you can easily end up with a horrific mess!
 
* Edit to add:
 
In previous versions the key binding was 'o' but many users remapped it to something less likely to be hit accidentally.

Bristol_Jonesey
There is no key binding in Platinum. the only way to go into Offset mode is by the dedicated button in the Control Bar.*
 

Keyboard Shortcuts>Key Bindings>Area: Global Bindings>"Envelope/Offset Mode".
 

Bristol_Jonesey
 
If you engage it and leave it in you can easily end up with a horrific mess!
 
 

Im afraid Im in a mess now.....  how do I get out of it....  im 60 tracks in

Is there a way to clear the changes you have inadvertently made?