Problem with this update is that the second part is part of an existing Animation. Therefore it can't just be 'attached' to a UI, nor can it be put into a file by itself.
I posted a little tidbit about this in the wee hours this morning roughly explaining how to go about fixing your mods to deal with these changes.... read about it
here.
Each UI that uses a custom EQUI_Animations.xml file will have to be patched individually. There's no way to make just one patch that will fix all UI mods, because each skin makes different changes to the animations file. An animations file for Vert won't exactly work with Quartz, and vice-versa.
If you are having problems with your UI after this patch, you will either have to make the changes yourself by editing the EQUI_Animations.xml file, or wait for the designer of your UI to release an update for it.
Personally I think that with a little thought and patience, most f you will be able to fix your own skins.
-Cormanth