I have some diffuculties with new 2015b release too. It's a litle bit same like previous post. The tcl file will not download bitstream correctly.
HDL Workflow advisor can sometimes program Zedboard, but usually it does not! If I use Vivado 2014.4 to download bitstream then it works. (Without tcl functions)
What I discovered was that "vivado_download.tcl"-file is not fully correct at this Vivado 2014.4 release. With Simulink 2015a and Vivado 2014.2 this works always correctly. But not anymore with new releases.
Original vivado_download.tcl file uses command "current_hw_target [get_hw_targets *]". If I remove this line from tcl file, then this works perfectly.
Is there any soutions for bitstream download issues?