This problem started some weeks ago and is happening in two machines now.
When I try to start some portable programs I see the launch screen. After some seconds the lauch screen closes but the program interface does not appear.
If I look at "task manager" I can see the program process but no user interface. Also tried various compatibility modes and "run as administrator" without success.
Finally I tried to open these programs inside a sandbox (Sandboxie) and they worked perfectly.
Some programs showing this behavior:
PuttyPortable
uTorrentPortable
Notepad++ Portable
SnapTimerPortable
Is there something I can do about it?