ndarkness:
Thanks pert, OldSteve for your reply and encouraging people to look for previous posts!I have installed the whole new arduino IDE v 1.6.11 and I have still the same issue, I will install Arduino AVR Boards 1.6.11 using Boards Manager as pert mentioned, otherwise I will revert to 1.6.9 to check.
I'll keep you posted
Kind regards
Did you delete the Arduino15 folder after uninstalling V1.6.10?
You should have tried pert's suggestion first. He's more knowledgable on these matters than I am. That's why I said I was glad he answered earlier.