AdWords API Re: Problems with addCampaign - An internal error has occurred. Please retry your request.

Richard:

Ads always appear in the Google results page. The search network is a
different thing:
"optInSearchNetwork - If specified and 'false', this campaign will not
run on Google's search syndication network. (Note that you cannot opt
out of running ads on Google.com.) The default value is 'true'."
So you can have both content and search networks switched off, and your
ads will only appear on Google's own pages.

Yes, the <log> element appears courtesy of the tracing mechanism Tibor
is using.

Google can cope with the wsa and wsse elements. I also tested no
region/language targetting and it works fine.

Tibor: the message looks fine. Could there be anything else wrong with
that account? A couple of things I can think of:
- you have too many campaigns in that account (I think by default you
can't have more than 25 non-deleted campaigns, although this can go up
depending on your spend)
- someone is accessing the account at the same time through the web
interface
If that's not the case, it might be a bug so you should contact Google
directly...