Arduino IDE sctreen is light blue, doesn't accept keyboard input

So what might cause that?
I can open files etc. but I can't edit them..Might this be a java issue and what to do?
thx

Go to Files, Preferences and uncheck "use external editor".

groundfungus:
Go to Files, Preferences and uncheck "use external editor".

OMG, I totally forgot I tried NP++ a few days ago...thanks