Getting Postgres related error - not using Postgres

Since this is a PHP Startup error, it happens before CodeIgniter is loaded. You probably need to look through your php.ini and comment out the line that is trying to load pgsql.so.

OK, that sounds sensible, but let me throw two new things into the mix:
1. I don't have access to php.ini this is a cloud server on Rackspace.
2. The problem is intermittent. Today I do not get the error on Firefox or Chrome but I get it in IE. Yesterday morning I was not getting the error on Chrome, but I was getting it on Firefox. Then later yesterday, I was getting the error on Chrome and Firefox.

I am at my wits end. I could try an all new installation with CodeIgniter 2.x. I currently have an application running using CodeIgniter 2.x without this error message.