No, RAD studio and AM is not installed on the same Box.
But I hav both AM 1.14 and AM 1.15 installed on the same Box.
I get same errormessage if I start FDexplorer from the IDE (AM 1.15) menu or from the browser in the AM 1.15 "bin" directory.
FDExplorer seems to work until you try to drill down into a table of a database.
I tried starting Fdexplorer with "Start as Administrator" if the problem was some sort of access violation related to Administrator settings etc, but that didn't help.
Anyhow, The FDExplorer in the AM 1.14 directory behaves correctly, and this rescues me just now.