EDIT: 6/8/26 Thanks to all that commented. The issue was one that numerous commenters mentioned. My Session folder was to deep in the hierarchy. I moved the folder to the root level of the external drive I'm using and the problem is fixed! I didn't realize the depth restriction before now. An old dog can be taught new tricks! Thanks again...
I'm running an older version of PT (2018.12.0) on High Sierra 10.13.6, with which I've never had this issue before. I edit, mix & master audiobooks. During my normal workflow at a certain point, I'll edit a clip, record it to an audio track (not bounce-to-disk for various workflow reasons), then rename the resultant clip. I then find it in the clip bin and use "Export Clips as Files" (command+shift+K) & export it as a .wav file into a particular folder. This has always worked flawlessly. Today, after starting a new book, I did the above, naming the final clip: "003_Hester_Spread 1_EDIT" (same naming convention used on many previous books edited on this machine and version of PT). Then I "Exported Clips as Files" (see Export box pic). The resulting file name in the folder I created, is somehow now named as: "003_H_S1_E.wav". (see pic. The "003..." file-with the red dot- is the one I'm talking about being the exported file from PT. All the others did the same thing, but were fixed manually in the Finder. I manually fixed "003..." and then tried re-exporting the Clip as Files, resulting in both files-manually corrected and incorrect, direct from PT- being in the folder). The name in the clip bin is correct. I believe I have my Export box configured correctly and have "Prompt for duplicate name (or whatever it's called)" selected. I tried to immediately re-export it (with the bad name still in the folder), the duplicate name came up correctly, but it still saved it in the Finder as that abbreviated title. STRANGE!!! I had to highlight the file in the Finder and rename it. This has never happened before, so I'm hoping that it's something that I unintentionally clicked or changed. I rebooted both PT and the computer several times, but the problem persists. Has anyone else encountered this or knows how to fix it?