A bug reported about 40 days ago has finally been fixed by Google. The bug was specific to the AdWords API not returning search volume data for certain months. The report was in the Google AdWords API Form and said:
We are using TARGETED_MONTHLY_SEARCHES to obtain the search volume in each of the last 12 months, and it returns search volumes for June 2009 up to March 2010, but it doesn't return anything for April and May 2010.
Several users of the API were left stranded for all that time. One said, "My company also relies on this data. I hope this is taken as high priority." Google did continually come in to tell people they were aware of the issue and engineers are trying to fix it.
The fix came August 2nd, Eric from the Google AdWords API team wrote:
This problem has been resolved, and there is now search volume available through June. Let me know if you see other unexpected gaps in search volume information.
Forum discussion at Google AdWords API Form.
