This post address the following problem:

The mouse over pop up at the Calendar View no longer works in version 2.5.

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At the calendar view of previous versions, the mouse over effect to display the brief information at the Calendar view was done with simple HTML and javascripts.

In 2.5, JQuery is used for better interface and speedy response. However, in order for this to work, the template for the Calendar view MUST be changed.

If you upgraded 2.5 over existing version, the template is not changed.

All you need to do is following steps:

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1. Backup your website and database (Recommended)
2. Click on Main Settings at the Module menu
3. Update the Template according to this page:
http://www.invenmanager.com/tabid/711/Default.aspx
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That's all!
Thank you.