Why do I get a "'Cannot solve algebraic loop involving block ..." error with my Black Box?
Make sure to comment out the "this_block.tagAsCombinational;" in the "blackbox_config.m" file for the Black Box, if you have at least one port that is not combinatorial.
Example from a "blackbox_config.m file":
% System Generator has to assume that your entity has a combinational feed through;
% if it doesn't, then comment out the following line:
If you are seeing this problem, but are not using a BlackBox, please see (Xilinx Answer 19941).