In Sitecore 8.2 Update 3, when I try and rebuild an index from inside the content editor (From the Developer ribbon) when the dialog opens that should be a progress bar showing the rebuilding progress, instead I get a little desktop:
I dont see an error in the logs but I do see in the logs that the index rebuild is happening. If I close the dialog, I get the index rebuilt successfully confirmation dialog.
When I make the rebuild request, there are two outgoing requests. The second one is checking progress. The first one is maybe opening the dialog?
And this one check the progress