screen 4.0.2 on solaris swallows 'kbo' -- why ?

[Marino Duregon]

Hello

I do a lot of cut and paste between my screen windows and realized that screen 
swallows the sequence

k b o  (without spaces in between them)

Can anybody explaining why ? It is screen because it does not happen when I am 
outside of screen (I tested it).

I am using screen 4.0.2 on Solaris 10. Are there new versions that I should be 
using ?

thanks

Marino