[edited by: Kobayashi at 11:26 pm (utc) on Nov. 7, 2008]
Just notice some of my keyword phrases, which are all lower case show when the first letter of each are both capital or both lower case while others only show if the keyword typed in is lower case as the bidded keyword was entered or upper case unlike the bidded keywords are entered. It is hit or miss, very strange, anyone else notice anything or know if any changes were made in this regard.
Based on what you've said, Kobayashi, I wouldn't be surprised if this is simply a matter of the ad not showing for each and every search (completely irrespective of case), due to a daily budget that is too low to allow the ad each time it's searched, 24/7.
AWA
After some further research though I think I figured it out using the ad diagnostic tool. Basically it is related to different classifications of search results depending on case of keyword. I thought before that when the search results of a keyword were classified as family safe or not it was regardless of capitalization. But now it appears that your system is making a distinction between the capitalized version of the search results and the non capitalized version.
So for example, lets say I have an ad classified as adult and I unknowingly bid on "family keyword". When I hover my mouse over the magnify glass it states "An Adult classification is preventing your ad from showing" which indicates the search results for "family keyword" are non adult and when I go to do a search for "family keyword" my ad does not show as I would expect but if I type in "Family Keyword" my adult ad does show.
Works the other way around as well so lets say I have an ad classified as adult and I bid on "adult keyword". When I hover my mouse over the magnify glass it states "Ad Showing" and thus I know the search results for "adult keyword" are not classified as family safe and thus my ad shows as expected when I go to do a search for "adult keyword" but if I type in "Adult Keyword" my adult ad does not show. When I run the ad diagnostic tool on "Adult Keyword" it states the ad is not showing due to an adult classification.
I could be wrong but I thought search results were not previously classified as family safe or not depending on the case of the keyword as they now appear to be, if so I would be curious if this is due to a design change or a bug, thanks!
[edited by: Kobayashi at 5:05 am (utc) on Nov. 11, 2008]