Thx all for the replies.
I have indeed console.log statements in the code that are there mainly for developer purposes (to get feedback on data container contents during the processing flows).
I could easily turn off all the console.log statements with a global flag that i had put in place to disable the console.log statements when the implementation goes to a productive environment, while still allowing to enable it to help with possible future support.
Anyway I set the flag to false, thus disabling all the console statement, and it works like a charm.
I was not aware IE made problems of the console commands when the console is not opened, so thx for bringing this to my attention. 