LIBUSB_ERROR_PIPE?

Since my last Windows Update (not sure that's the cause), I'm having a hell to regain access to my Terratec DVB-Tstick with ther Elonics E4000 tuner. I've modified librtlsrc.c to include some more traces and relinked rtl_test with it. All I'm getting is LIBUSB_ERROR_PIPE trying to read/write the I2C-bus: Osmocom-SDR\src\rtl_test.exe Found 1 device(s): 0: Terratec T Stick PLUS Using device 0: Terratec T Stick PLUS librtlsdr.c(392): I2C addr C8: got 00, rd_len: -9, wr_len: -9 librtlsdr.c(394): Read error: LIBUSB_ERROR_PIPE, Pipe error librtlsdr.c(396): Write error: LIBUSB_ERROR_PIPE, Pipe error librtlsdr.c(392): I2C addr C6: got 00, rd_len: -9, wr_len: -9 ... No supported tuner found Enabled direct sampling mode, input 1 Supported gain values (1): 0.0 ---------------- What could be the reason for this? What else should I try? --gv