Piano Roll : Select CC along with notes... MIDI Editing almost impossible...

Hello... I have Latest X1 Producer Expanded, and I am facing a weird problem, never noticed before... I have recorded a real time MIDI track of a Piano, and now, want to fix some little glitches by Piano Roll... I found that leaving checked 'Select Controllers along with notes' it makes almost impossible to select/move more than few notes at time... The CC 64's ( Hold Pedal), the only ones present in the track, are very few, and 'cleaned' from any transition values to be only 0 or 127... Now, if I even select few notes, may be less than 10, with/without any CC 'linked' to them, moving for example such notes a little earlier or later, the transition is stuttering... I move the mouse, and notes are moved about 2 or 3 seconds later...this makes impossible fine tuning... My Platform is quite powerfull, i7 2600K @ 3.4 GHz, 8 GB RAM, nVidia GTX 560 i, Win 7 Pro 64... I can not believe this is a normal behaviour or a graphic problem...and can not think of which strange selection/move algorithm may cause this... I already edited a lot of MIDI data before, and never noticed this, however it's few time I do not edit MIDI, so, I can not be sure if this came with an upgrade of Sonar, or may be new Video Card ( which would be quite strange )... I always edited MIDI notes, along with CC, and never noticed this problem... Anyone has the same problem...? Any suggestion about what to check...? Thanks to all... Alex