Recently (a few months?) Greenshot sometimes doesnt respond immediately to print screen commands. The tray icon is unresponsive and the short cuts do activate it but Greenshot only activates 2 minutes later.
Activating Snipping tool sometimes helps it refresh.
The lag between requesting it and Greenshot responding is not consistent. Sometimes it works just fine.
I've been using Greenshot for some 3 years now and this has only been a problem for the last 3-4 months.