Hi. Strange problem here - no windows dialogs will open from ADE, so I can't; Open Airport, Open Airport from BGL, Open Airport from XML Any ellipses in regular dialogs do nothing. Just to be clear this is the first time running ADE in a long time, I no longer have the version I used to use, so this is a clean install. I have v01.70.6042 running in P33 mode. The only thing that happens when I try any of those options is a very quick white flash on the title bar of the application noting that it is losing, then regaining focus. I checked and .NET 3.5 is enabled in my windows installation (along with other, newer versions.) It might be worth mentioning that my build of windows is an insider build, specifically 16170.rs_prerelease.170331-1532. Is there any way to narrow down what might be causing this issue? As a last note, I managed to find a copy of 1.65, which shows the same issue. But a copy of 1.20 does not, all dialogs work in that version.