DDE stop working on Build 166

 
After I updated MT4 from build 166 to build 169, the DDE in my excel spreadsheet only works around 1-2 minutes after the spreadsheet is open, after that stop working, with no more updates. I installed again the build 166 and now is working properly as usual.

Is this a bug, or something that I need to be setup for this build?

Thank you
 
thanx. we'll check
 
I updated MT4 from build 166 to build 170, and in this last build the DDE only works for the USDJPY pair, the other pairs dont work (no values at all). Now I went back to build 166 :-(