Anything become of this? 2017.3 Advanced customer is complaining of disappearing windows on a PC (just Sage), and I'm able to duplicate on file server (although not always). It's hit and miss... PC will work fine for a few days, then windows start disappearing every few seconds (regardless of task). In all cases, Sage launcher stays open... only the tasks disappear. No errors on screen or in any of the Windows logs. Sage is clueless. MAS90 mode, all is OK. No change when running Sage application vs. service.