@matthew –
Two separate sites, it killed the Easing Slider plugin after update with the same error – “This plugin has been removed because it no longer exists”. You then have to activate the new plugin only to discover that the slider, all the images, settings, etc – are nowhere to be found. Probably because of the new name?
It kills it this same way each time I try it with my backup copies of these sites, too – I wanted to make sure the client hadn’t done something silly. Standard WP upgrade procedure.
It’s not a huge deal, since I had opened the original slider page up before I did the upgrade – but if I hadn’t done that, I’d have had to figure out how to find what the slides were before the client upgraded (no easy task).