Can’t Select Regions for Cut-Extrude

Hi, 

 

I'm using SW2025 SP1.1

Often I have problems trying (and not succeeding) to select regions for cut-extrude.

The sketch is closed and so and so.... Even weirder, The same sketch (not a copy, not a new sketch using with converted features... the same!) used for several Cut-extrude, and several extrude operations, allows me to choose regions for some and not for others of these operations.

Is this a known problem ? it seems to be 

 

 

is there a workaround? new Servicepack? hotfix?