You're really pushing it! As a USB 2 device (will work on a USB 3 port though), the maximum cable length stipulated by the USB 2 standard is 5 meters or about 16 feet. The UR interface is signal-time critical and must be connected directly to a primary USB port on the computer (i.e. cannot be run over a hub). With a USB2 type audio interface, the shorter the cable the better, and pushing the cable length to the limit is only asking for trouble - if indeed it works at all (which, it would appear by your endeavours, it does not).
I'm sorry to say - but you're SOL in this regard.
...yes I think it can be easily done, just take everything down to Highway 61.Sun Point Studio Turbenthal, SwitzerlandCubase 7.5.30 - 64bit | Cubase AI7 | WaveLab 8 - 64bit | PT10 | UR28M | UR44 | CMC-PD/4xFD/QC/AI/CH/TP | BCF2000 | Shuttlexpress | Graphire Tablet | Cubendo Custom Keyboard | Lenovo E31 Workstation:Xeon E3-1225V2/3.2GHz; 8GB DDR3 SDRAM; 2x Intel-Flash520 SSD 180GB (C:/D:);1TB 7200rpm Sata3 (F:); DVD RW (E:); Ext. 3TB USB3 Freecom + WD 1TB; Nvidea GeForce GT 630 4GB DDR3 Video Ram AGP PCIE | Win 7 Pro 64 Bit