Document Size increases on changing from Higher PPI to Lower PPI || What exactly is PPI - Pixels Per Inch in a Photograph

First of all, Let's understand what PPI is ? PPI stands for 'Pixels per Inch', which has literal meaning that when a image is constructed, how many pixels are places in one inch region of that photograph. More the pixels, better is quality and increase the chances of using this image for various purposes. This is one of the reason that many times people reduce the PPI for a photograph before posting on websites or blogs, so that others can't use them for any commercial purpose. Let's continue this discussion from here...

Why Menu Items disapear in Organizer of Adobe Photoshop Elements : Hight DPI Problem

Sometimes Menu-Bar (File, Edit, Find, View, Window, Help) in Organizer disappear.

In this state ">>" is shown on title bar of Organizer and whole list of Menu items is shown on clicking this. It happens on some abnormal DPI values, I guess DPI greater than 96.

How to Resolve:

1. Go to Preferences and switch to System Fonts

2. If it doesn't work, change DPI value to 96 and problem should go away.

How to Change DPI:

Windows-XP:  
Start > Control Panel > Display OR
Start > Settings > Control Panel > Display >> Click Settings > Advanced.

Vista: Windows  
Start > Control Panel > Personalization > Adjust Font Size (DPI).

Windows 7:  
Start > Control Panel > Display.
Then Click on 'Set Custom Text Size (DPI)' on the left side options.