Browser incompatibility with Articulate & LMS

Good morning,

We have experienced a lot of technical issues for the last 6 months regarding browser incompatibility. With new browsers IE 10 & IE 11, many of our courses did not close or function properly. We had to run Articulate updater through all the courses and re-upload them back to the LMS. It still did not fix the issue. We are receiving a lot of phone calls on a daily basis regarding technical issues with course performance in LMS & browser incompatibility. For instance, in order for the courses to run properly, we had to advise to adjust the compatibility view settings and add the LMS vendor to the trusted sites within IE 10 & IE 11.  We have received the following concerns: the “Exit” button did not close the course; the “Finish” button in the quiz won’t let you proceed to submit the quiz, the course did show “In Progress” even though the settings within the courseware and LMS are set to “Complete/Incomplete.” The LMS vendors mentioned that we're having the browser incompatibility issues because the courseware was developed in Articulate. Could you please help? What would you recommend to fix the browser incompatibility issues? Will it be possibly the LMS browser incompatibility/performance as well?
Thank you for all your help in advance.