Hi,
I tried today to export a workflow from an O365 list with IE 11 (on Windows 10) - but without luck. Nothing happend, no download and no error message. Then I tried the same workflow with Edge - and voila!
Anyone else experiencing the same behaviour?
OK, I resolved this behaviour - I had https://*.nintex.com in my trusted sites. Because https://tenant-guid.sharepoint.comcom was not trusted this results in a mixed security-context and thus IE will not download anything from this URL.
I have this issue in IE 11 as well, but I don't have control over trusted sites etc... Just end up loading it in firefox or chrome and works fine 
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