Msg#: 4497197 posted 6:30 am on Sep 19, 2012 (gmt 0)
Good thinking but I don't think so. That's a campaign option isn't it? - I have bidding option set as 'Focus on clicks, manual maximum CPC bidding' and I'm being bugged to use Optimiser which suggests that isn't turned on either (not sure where to be certain)
Besides, not all adgroups have this problem and the search CPC behaves itself fine
"For this particular adgroup, the display CPC is set at 30c"
You can set an Ad Group level bid, but can also set different bids for targeting mechanisms, G uses the one that's most specific / restrictive / applicable (for example, for a placement targeted click, your placement bid for that placement trumps the ad group default bid).
Check your bids for keywords, placements, audiences, etc.