The issue has been identified and a new 0.8.7.2 client has been released for PC and the source can be found on GitHub. The algo change went through and worked as expected but somehow the block time change upset the network, the block time change was applied before the as we moved back to a conventional difficulty adjust during the algo change. This was done as NGW does not like to have its difficulty forcibly set. Somehow this change did not permeate through the retarget changes back to a conventional difficulty adjust and then back to NGW. I am away on holiday at the moment but will be back in my office tomorrow so can create the Mac client and will work on the block time change again.

Apologies for all the trouble caused with this update but the most important part of this fork was successful. Keep an eye out for a newer version soon changing the blocktime.