Hi guys,
OutSystems gave me an answer that can help some of you.
If you have an 11th Gen Intel CPU and a Intel Iris Xe Graphic Card there are some issues with drivers that have this miss-behaviour in Windows Applications, being Service Studio one of them.
Please remove the Hardware Acceleration from Windows by running this on the command line:
reg add HKCU\SOFTWARE\Microsoft\Avalon.Graphics /v DisableHWAcceleration /t REG_DWORD /d 1
Note that this is only a workaround until the problem is fixed by Intel / MS / OutSystems and can be rolled back by entering 0 on the end.
Hope it helps.