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This started with SP2 for Inventor 2012... and still actual for Inventor 2014 SP1!
Whenever user opens (switches to) IDW-file the browser area becomes non-stable if "ESKD Support" add-in is loaded.
Autodesk was informed about it via case 07300659 (June 2012).
Issue was confirmed but case was closed in August 2012 without any real support: "fix will be most likely in the following version".
14 month have passed.... I wonder how long should we wait for this particular issue to be fixed?
Manual workaround - switch browser OFF and then switch it ON.
Unfortunately this workaround does not help when done through API.
PS: The issue is actual for Inventor 2015 Update2