Nothing like that, AC on or off makes no difference.
I do however have a small exhaust leak from the turbo to down pipe. Could it be that the ecu logic starts to command richer afr to even out the lambda sensor readings??

Just to add to this, I get commanded afr's of 14.2 at idle and the only way to stop it is to reflash the tune.

Because usually requested load does not differ much per different gears. WGDC table is just a "base" table, the actual wgdc is afterwards adjusted depending on what load was reached. In higher gears there is usually quite much time for ECU to adjust to it accurutely, so I would try to mat...

Is it just me or has this button disappeared in the latest vt version?

Have a read through this

http://www.versatune.net/forum/viewtopic.php?f=13&t=111

mrQQ wrote:vac leak would be positives.

Of course, brain fart on my account!!

Vac leak maybe, check the tip to turbo connection.

I keep getting commanded afr of anywhere between 14.2-14.5 even though my tune calls for 14.7. If I reflash it usually sorts itself out. I'd estimate every 3rd flash induces this anomaly, is there any particular reason for this?

Hmm.. I would like to know the answer to this too.

Driver mod required, you've been driving a 6 for too long.