I recently set up Max MSP (latest of ver 9) so that I can use it with the Daisy Seed and Patch.init that I have. If I set it up to program either one just using the built in USB, it works fine without errors. If I set it up to program it with an ST-link, it seems to work but I always get a DFU error at the end. I tried this on both Windows and MacOS and appeared to get the same issue. I do have oopsy.js set to use make program and the activity lights on the ST-link do flash. The LED on the Daisy also flashes showing that the code was loaded but I still get a DFU error. I have the latest version of the Daisy toolchain, Oopsy, and Max MSP.
Maybe this is just a false positive with the Oopsy.js code?