Hi guys.I have a US-1641, the model that pre-dates the 1800, and I have the same issue. Logic sees it but will not work at all with it selected as a source. I've also had many hangs, spins, and kernel panics while the device is attached to my machine since upgrading. All symptoms of an incompatible driver. Tascam's site only shows drivers for these devices running OS's as late as Yosemite. I hope they eventually update them.But for now I'm in the process of wiping my machine and re-installing Yosemite.

I'd suggest you guys do the same. Oh, and of course, backup first.-Adam. I've got the US-600, same problem as you. I had do remove the drivers as well becase they seem to slow down my machine even with audio card not plugged in. A couple of days ago I've noticed something intereseting, after 10.11.1 update: Native Instruments plugins (that weren't working after 10.11 update) now are ok, and plugging the US-600 dont's slow down anymore the system.

The compact X1204USB mixer allows you to effortlessly achieve premium-quality sound, thanks to 4 onboard studio-grade XENYX Mic Preamps and ultra-musical “British” channel EQs. And our easy-to-use “one-knob” compressors provide total dynamic control for the ultimate in punch and clarity, while respecting all the power and emotion you. Built-in stereo USB/Audio Interface to connect directly to your computer. Free audio recording, editing and podcasting software plus 150 instrument/effect plug-ins and ultra-low latency driver downloadable at www.behringer.com; Channel inserts on each mono channel for flexible connection of outboard equipment. Behringer xenyx x1832 usb full range of Behtinger equipment from all the leading equipment and software brands. With this one knob, you can easily dial in the perfect amount of compression for instruments and vocals, creating powerful mixes with punch and clarity. TRANSFER: You may not rent, lease, lend, sell, redistribute, sublicense or provide commercial hosting services with the Software. You may, however, make a one-time permanent transfer of all of your license rights to the Software to another end user in connection with the transfer of ownership of your Product, provided that: (i) the transfer must include your Product and all of the Software. Behringer xenyx usb drivers.

Unfortunately now there's no driver installed and (as said in v.3.00 drivers release notes) they cannot be re-installed. Someone knows which files I have to restore to Library or other system folders to try if the audio card is working now?

UPDATE:I've managed to restore the drivers/configuration files in original positions, now the device is available again in Tascam Control Panel and in audio settings.Unfortunately, no changes in behaviour: when plugged in the device is still not working, it emits only clicks' and system is slowed down.At this point, I fear the only way to solve the issue is waiting for a new driver update, or replace the audio card:/ I hope they will release the driver as soon as possible, last year the first beta was released in January (3 months after the OSX update. Its same ocour whit M-Audio Legacy interface. To resolve make this:Turning Off Rootless System Integrity Protection in OS X El Capitan 10.11 +Again, the vast majority of Mac users should not disable rootless. Disabling rootless is aimed exclusively at advanced Mac users.

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Note – This software can only be used with Mac OS X 10.2.3 or later. Open the ‘US-428 Installer’ folder and double-click on the ‘US-428 Installer’ icon. If necessary enter your Name and/or Password into the ‘Authenticate’ window to allow software changes under Mac OS10.x and click ‘OK’.