I have this exact one, and I don't reccomend using it with the Saleae Logic software, it constantly drops out and has issues enumerating. Haven't tried sigrock yet.
The Saleae software is designed for use only with Saleae products. Anything else is a clone.
I wouldn’t be surprised if they intentionally made the software frustrating and buggy to use with clones. The software (which is great) is funded by hardware purchases.
I think the firmware might have some timing issue with the USB bus, and just a few extra nanoseconds of a 2 foot long cable seems to break it.