One of my background jobs hung for 8.5 hours. No crash, no alert. It just stopped, and everything queued behind it starved.
Cause: it walked the whole dataset with no bookmark, so every restart began from zero.
Added a per-page bookmark. 8.5h to 2s.
"Running" isn't "working."
An MLS platform kept scrambling photo order on listing uploads. The filenames were fine.
It ignores filenames and sorts by file size. Undocumented, obviously.
Fix: pad the JPEG byte sizes so they sort right. Zero pixels touched.
Old software's real rules aren't written down.