Disappearing MIDI regions?

Ouch!

What version of Logic are you running? (Please add this in your profile, it helps with troubleshooting).

I've had similar behavior, with regions ending up on the wrong track, but not disappearing regions. This had to do with bad behavior from the 'delete unused tracks' function.

But in this scenario I have the feeling that you've accidentally hidden those tracks using the ol' hide function. Make sure your key command to hide tracks isn't easily pressed. If necessary, re-program it to be something difficult to invoke accidentally, like CMD OPTCNTRL-H as a precaution.

The other thing that could have happened is that you accidentally sized your track height to be so small that it's virtually invisible. If this is the case, look for the key command that resets the vertical zoom height of tracks and use that command to restore all tracks to the same height.

Logic doesn't exhibit any behavior that I'm aware of where after a fixed period of time, like a week, where some attribute of Logic's display gets restored. I think there's a more [ahem] logical explanation for this behavior. ;-)

OK, let's try a few things...

1.
• Turn Cycle off
• Select a track that contains one of the missing regions
• CMD-C copy
• Create a new track with the same instrument, select it (natch) and then use the "paste at original position" command (note that this command is different from regular CMD-V paste). See if your regions show up on the new track.

= OR=

2.
• Cycle=off
• Select All (CMD-A)
• Use the "pack folder" command
• Enter the folder and see if your missing regions appear there

Lemme know if either of those things work.

-=iS=-

Wow... I'm sorry, I'm tapped out on ideas... And to paraphrase a line from MIB, "this one rates a 10 on my weird sh*t-o-meter."

I have gotten these "missing regions" where whole parts of my song disappear; even my BACKUP songs would also have the same disappearing regions, making a return to my old song impossible. This would only happen after I saved my project and re-open it later, just as you describe.

I have no solution to how to bring the regions back, but I narrowed my problem down to the following bug in the matrix editor, which I've documented in this thread: http://discussions.apple.com/message.jspa?messageID=767597#767597

long story short, the problem occurs for me when I am editing multiple tracks in the matrix editor, upon which trying to drag/extend/copy/paste multiple parts at once will sometimes result in an error message. When you click "ok" it looks like everything is fine, but under the hood logic has had a major problem and when you come back to the same song, regions will be missing. The only solution I've found is to continue off an older, unaffected version.

Because of this I now "save as" frequently and avoid editing multiple tracks in the matrix editor (you can view them, but double click the part you want to edit BEFORE you edit it). Sometimes in the heat of the moment I forget and will edit multiple parts at once. When the bug happens, I export all midi data and re-open an older song, paste in the data and continue.

Hope this helps.