I'm finding the issue that Kevin describes, while trying to create an instrument from loaded samples. I'm able to preview while browsing samples, and then import the layer. But... no matter where I look, I cannot find a mute/solo/activate or level setting to explain my inability to hear the sample, despite however I attempt to trigger it. I'm glad to read that it's a known bug, I'll stop beating my head against it for a while.
Hey, I'm not receiving emails notifying me of updates - could you please contact me somehow once it's resolved? Thank you.
Also, the auto-preview feature in the browser (and the browser's custom GUI) are wonderful updates to Spark, as are the shortcuts to navigate the software from the hardware device. Copy/paste shortcut = very welcome. (Just... careful not to erase what you're hoping to copy!)