Database Lib Loading Issue

[eluser]Narkboy[/eluser]
For some reason, when I try to start the database library (in autoload or controller) CI fails to run properly. Without it, I can load my welcome controller in an instant - with it, it loads for several minutes before displaying a blank page - Apache reports a 200 message in the log.

No errors are displayed or logged, and nothing appears to be initialised (welcome has profiler on).

I'm using 1.7.2 with MySQL 5.1 on Apache 2.2 on Win7. I've recently updated all the server apps and now all of my sites with the db lib fial in the same way. It doesen't seem to matter if the database.php file is correctly configured or not.

Anyone else seen this or have a solution? Help!!

Thanks!