$(...).switchClass(...,...,"slow");

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If you transition between a certain color class to a different color class, the transition moves slowly. If you were to go from a background color class to a transparent class. The transition is messed up.

Pretend:

1. the parent div has a green color background.
2. the child before switchClass(...) called is css{background:transparent}.
3. the child after switchClass(...) called is css{background:yellow}.

What will happen is the background will shift straight to white making a weird appearance, do the animation, then go to the correct color.

Let me know if you need some sample code.

[jitter]

The big red box on the "New Ticket" rather clearly states:

For jQuery UI (Autocomplete, Sortable, Draggable, Tabs, etc.):

This is NOT the correct form!

This tracker you submitted your bug on is for jQuery core bugs only. Thus to file a report for jQuery UI you will need to re-submit your ticket to the ​jQuery UI Bug Tracker for further assistance as they handle all UI-related tickets. Thanks!