Hi, yeah I've tried reimporting Wwise several times. I noticed that the script compilation doesn't seem to be the problem - error appear (or disappear, if fixed) after the first few seconds (which is a fairly normal compile time for us), but there's a longer delay after that, where Unity can hang, and the compiling spinner at the bottom-right of the Unity window doesn't really spin. My assumption is that this is a step performing audio compression or copying files from one place to another. It doesn't happen if Wwise is taken out of the project.
Thanks