Update Asset Indexes not working for large number of assets I am trying to index 1.8GB of assets to an asset source on Craft.

I have created an Asset Source which points to the folder with all of the assets. When I select the Asset Source I want to update the index for and select "Go" the loading screen runs for a while, then shows me a confirmation checkbox, but nothing has happened.
While Craft appears to give you a success message when the Update Asset Index modal displays a pretty checkbox, when working with a large number of assets, if you don't see a loading bar appear or see the indexed assets afterwards, it's possible you are running into a memory issue, and that pretty checkbox is lying.

Likely, if you look at your craft/storage/logs/phperrors.log you will find a memory error. Try increasing the memory available to your Craft install or increasing the memory_limit in your php.ini settings and trying again.