Have you ensured that the /api/atelier/ web application has the %Developer role assigned, this caught me out initially.
More info here: https://docs.intersystems.com/atelier/latest/index.jsp
OK so I have now got this working after a lot of googling etc. In the registry at Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION ensure you have a REG_DWORD entry for eclipse.exe with a Decimal value of 11001
Hopefully this should help anyone facing this issue.
Glad it worked for you, I eventually ended up at this page: https://social.technet.microsoft.com/Forums/office/en-US/51e90fff-716e-4a5b-9fa1-aa2dbf52a26b/internet-explorer-11-always-runs-in-ie7compatibility-mode-when-integrated-within-an-eclipse?forum=ieitprocurrentver
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