There appears to be a bug in Adobe Reader X 10.1.1 for Macs. Rollover states of buttons don't work, they just flash temporarily and go immediately back to the UP state. The click state works fine. Am assuming this is not the way buttons should behave and therefore most likely to be a bug. Since the images in my PDF ebooks are before-afters of retouching, based on rollover buttons this ruins the whole book. It works fine in 10.1.0 on the same machines. So far we have had 2 support cases on this but am expecting a barrage!
We have tried to download from the Adobe site but am always taken to 10.1.1 so if you know of a link to earlier versions this would be a temporary workaround. Please Adobe have a look at this and release a new fixed update asap!
A known bug we've been watching for some time, see my post for a workaround. The next Acrobat Family patch is due Jan 10.
You cannot remove a dot patch in isolation, you would have to uninstall Adobe Reader completely and reinstall the previous build. Adobe don't host previous builds of Reader on their main site, but their FTP site (and the FTP mirror service) holds copies going back at least 4 major versions.
Thank you, we found and tried the reinstallation of 10.1.0 and it worked. It's almost a relief to hear it's a bug because this could potentially be a disaster for our ebooks! It's also good to know that it's not something Adobe have done intentionally. Thanks for confirming it.