I have a iMac and a QStarz BT-Q1000X. Everything works fine. I get connections, can download and configure my GPS logger. But if i start a download, where I get a warning "...data is different. Want to overwrite..." (something like that), the application starts a download, which will never finish. The application does not respond anymore and cannot be killed in some cases. It also seems to destroy the data. If i restart the computer and start the download again, most of my data is gone.
I added a screenshot of my configuration (i restarted my mac and started to download new data).