For the record, I'm on a Mac, using 14.6.1. and the most recent version of Kyma.
I'm having issues with .WAV files. I seem to remember that I used to be able to drag a .WAV file onto the Kyma application in the dock or in the application folder. I can't do that these days. But I can drag .AIF or .AIFF files onto the Kyma app and I can open most (but not all) ,WAV files from within Kyma using the file::open (or command-O). In instances that I am unable to open a .WAV file, I get the following warning ... which requires that I quite or force-quit Kyma and shutdown my pacarana.