It seems that sometimes the Buffer Tab of the Files Tools Window doesn't show all of the open files, like its somehow gets out of synch.
I can still get to these "other" files using the Files Tab Bar.
If I close one of the files which isn't showing up and then reopen it, it shows up in the "Buffers" window ... so its not a filter issue.
Every now and then, all of the "missing" files will just show back up ... e.g. during my experimenting to write this up, I opened a file from the "Search Results" window and all of the other open files showed up in the "Buffers" list.
Anyone else seeing this?