There was an issue with some of the features when a password protected VBA Project was loaded. This caused several of the tool window, most notably the Test Explorer, to fail to open. As many of the more popular add-ins are password protected, this was a pretty big problem.
This has been corrected and the 32bit installer is available now. This post will be updated when the 64bit installer is available.
Rubberduck News 
Reblogged this on Christopher J. McClellan and commented:
Squish the bugs. Real blog post coming soon.
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