Has anyone experienced that when playing a midi instrument(keyboard) whether you recording or not, freqently some MIDI notes hang.  Have to click the "panic button" to release the note.
If I'm recording I can see in PRV that the notes are very long.  It makes no difference whether I use plugins or not.
 
Interesting that I don't have any issues with X1. 
 
X1 runs on Win XP 32 bit,   X2 runs on Win7 32 bit.  Same PC but installed on different HDD with clean install.
 
Advice is appreciated
 

You need to go change your setting in preferences to 500 from 256. Sorry, I'm not at my DAW so I can't tell you the setting, but it's on the bottom of one of the bottom items in the advanced preferences screens. You probably forgot to set it again after upgrading as I did also. It solves all midi issues.

midi buffer size

Thanks guys I will check it out tonight when I get home.

open up x1 in your dual boot and examine the preference menu/midi.
now open up the same menu in x2 and compare them.
sounds like a midi buffer size issue to me.

The "Prepare Using" buffer is a playback setting. I would not expect it  - or any other config setting in SONAR - to cause hung notes during recording, if the hung notes manifest as long notes in the PRV. The only thing that would account for that would be the failure of SONAR to receive or record a note-off from the controller.

Other than changing track focus (while depending on "Always Echo Current MIDI track" to echo input to the synth) or otherwise interrupting the input stream to the recording track while a note is held, I'm not sure how this would happen, and I can't imagine it happening only in X2 unless it's a bonafide bug of some sort.

If the MIDI keyboard is connected by USB, there might be a problem with that interface, but I would expect it to affect all versions of SONAR.

Thanks for all your info, I've compared X1 and X2 preferences but made no diference the problem was still there.
I've decided to wipe the HDD.  Re-installed Win7 and associated drivers, next is to install X2.  
The audio/MIDI interface is a Presonus FP10 with firewire connecton to the PC.  Everything is connected to that.
Will post the result,  good or bad.

Here is my finding with the problem I had(this may or may not relate to others)

After complete HDD reformat new Win7 with SP1, X2 with Rapture all the required drivers for my Audio and MIDI gear,    it still behaved the same way ????  what da.........

I had a spare Edirol UM-1S USB MIDI interface unit. Installed that with Win7 compatible drivers and my problem dissapeared.

Best Regards to all.

My conclusion  is  that  the "PreSonus Firepod" has driver compatibility issues with Win7. Windows XP is OK.

A few questions:

- Does this happen with any synth or only Rapture?
- Are you using a DX or VST version of the synth?
- If you switch to the presonus driver MIDI input again does the problem recur? 

Certain DXi instruments have problems with X2's method of triggering them which is why I asked for the info above. If so there is a registry setting for compatibility.

If you believe it to be hardware related, you can use a MIDI monitor plugin to troubleshoot if note off messages are being lostAlthough if you say the same interface behaves ok in X2 it would seem to rule that out.