Efrat yes - that's exactly what I am saying. I've got anecdotal examples from the employee using IE, Firefox, Safari, Chrome, on PC's, IOS and android devices. They all report completing the quiz with a passing score but the module still shows 'in progress' in the LMS. When they try to re-enter the course in the LMS it freezes in the browser, just a white screen. Our problems have been limited to Rise modules - I have another module that's all in SL and have had zero issues. Support in the LMS (and with Articulate) has been unable to replicate the error. It could be something with the client's intranet, but there are cases where the users are logging in on their personal device and still having an issue. We use a cloud based LMS, so you would think it the issue was the customer's intranet we'd be able to tell. All of that to say, I personally have not been able to recreate the error.
I love Articulate products and have been using them for years....but this is a challenge for us.