I wonder if your 90,000 keywords may be a factor? AdWords folks suggests a maximum of 50,000 keywords per account. Beyond that number, account issues may occur. (The most common effect being very slow navigation within the account.)
Just to repeat this often repeated info - the suggested limits are:
* 25 Campaigns per account
* 100 Ad Groups per Campaign
* 750 keywords in a single Ad Group
* 2000 keywords in a single campaign
* 50,000 keywords in an account
AWA
Go to each of the AdGroups and click on the FILTER KEYWORD link. Under filters, select NUMBER OF IMPRESSIONS and IS EQUAL TO. In the field, enter 0 and hit the "Filter Keywords" tab.
Select all the keywords and hit the DELETE button. Repeat the process for all the AdGroups.
If a particular keyword has not received any impression in the last 30 days, the possibility of receiving any impressions in the future is quite negligible.