Cable Between Physical Input and Seq. Input Disappears By Itself

Question

Today, inexplicably, while recording routine MIDI overdubs on a cue, I suddenly lost MIDI thru from my master keyboard thru Logic to my MIDI racks. MIDI tracks played fine, but no MIDI thruput.
Tested the MIDI interfaces, AMS, rebooted the computer and the interfaces, all the usual stuff. Couldn't find any reason why I suddenly lost thruput.
It was only because I was at my wit's end that I decided to look at the Clicks and Ports Layer in the Environment to see if anything "somehow" got weird. And sure enough... the cable between the Physical Input and the Sequencer Input had disappeared. Gone. Vanished. Deleted.
How this could have happened without my deliberately going into the Environment, selecting the Clicks and Ports Layer and purposely deleting the cable connection is totally beyond me. This has got to be one of the weirdest behaviors I've seen. And just remember everyone, "weird" is an anagram for "wired" which, unfortunately, proved not to be the case.
Anyone else ever have this happen? Any ideas as to what might have caused this?

Answer 1

Amin,
I've thought along these lines too, surmising that: items (or data) which were selected/highlighted in various windows at various times were somehow still subject to such actions as Delete, Cut, or Clear, despite the fact that those windows were currently closed. Now, I rarely (closer to "never") have need to visit the Clicks/Ports layer of the Environment, let alone tinker with the connection between phys input and seq input such that that cable might ever remain in a "selected" or "highlighted" state to begin with.
But in an effort to troubleshoot the missing cable scenario according to this theory, I deliberately highlighted the cable, closed that window, and continued working. I was hoping that at some point during normal editing operations I might lose my MIDI thruput again (because it got cut/deleted/cleared in association with a cut/delete/clear operation of another event or object) and then backtrack through the Undo History hoping to discover what operation caused it.
Well, 1.5 days later, after intensive editing of the same sequence (which ended up becoming quite complex) the cable stayed intact! So to a certain extent I think perhaps my theory is wrong, but I'm keeping an open mind.
But something valuable came out of this... considering LPH/David's information, I think that from now on I'm going to eliminate the physical input and sequencer input objects from my environment; they've proven to be a liability. And it's easy enough to add them to a song in the event I want to do some MIDI processing on Logic's input side.
I'd like to respond to your thoughts on floating windows in a separate post.
Cheers Amin!