@pink-posh Thank you so much for your swift reply, it is tremendously helpful when people answer back because that way it’s easier to track the issues! I’m glad you have the latest version. Fortunately it’s not the final version 
I’ll investigate this issue on my end, so I can help Matt to get to a proper solution quickly. For now it seems my test sounds are working but the sounds you linked all give me the same problem you mentioned.
For now I can offer you a small workaround. Please download the free program called audacity (http://www.audacityteam.org/download/windows/).
- Open the file you want with it.
- The re-export it as a WAV file. It appears as WAV(Microsoft) PCM 16bit signed.
It will be a lot bigger, BUT, you will be able to import the file now! I tried this with the one called “Can’t Sleep” by Kflay.
We’ll try to report soon meanwhile, but hope you can keep working while we’re at it!