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In SharePoint 2010 if CMSSiteManager.js library is loaded besides jQuery, then much of stuff stops working. The reason is that the dollar sign ($) is used in cmssitemanager.js as well which conflicts with jQuery. Mostly it appears on pages where you load jQuery and have an image library with thumbnails. To avoid this, just replace all $ with jQuery in your custom scripts. A more crazy situation is when avoiding $ isn’t enough. It is when you load jQuery to page head automatically on all pages. The Asset picker (AssetPortalBrowser.aspx) invokes $ itself and gets with jQuery in conflict without you write a single line of custom javascript code. You usually get the following error:

Uncaught TypeError: Cannot set property 'display' of undefined

Or in IE:

Unable to set value of the property 'display': object is null or undefined

The solution

I found a good solution in Brad Curtis’ blog. Run in your script:

jQuery.noConflict()

Brad Curtis creates an additional script file. But it is okay to have this line in your javascript file, so long you load this every time jQuery is loaded. So put this before your javascript code:

// this puts jquery into no conflict mode 
//which will remedy conflicts caused by jQuery when used
// with certan publishing features
jQuery.noConflict();

Important

If you use jQuery.noConflict, the dollar sign ($) is not available anymore! So replace all $ with jQuery. (Unless it is inside modules… another time about that…)