What would prevent my assets from reindexing on a local MAMP install Having an issue with assets not reindexing from the Update Asset Indexes option.  If I add new folders to the file system they do not appear after I run the Update Asset Indexes, if I upload them manually in the backend then they do appear as normal.  

How would I diagnose this?  Running Apache as my logged in user so it's does not seem to be a group / permissions related issue.
If the Update Asset Indexes fails on a MAMP install, double check to make sure ALL assets source paths are correct and exist on the file system.  

I had defined a asset source to a folder which I had planned on using but had not yet created on the file system, and this caused the Update Asset Indexes to fail w/o any warning messages, save for a JS error in the console.