Levels uneditable. Editor stuck with "Updating Asset References"

anonymous_user_bc2fd81a
Fri, 06 Oct 2017 16:27:30 +0000
Cinematics & Media

4.18p4.

1. Open provided BugDemo.uproject, Base.umap will load.

2. Try deleting or renaming any Actor from the World Outliner.

3. Some Actors are referenced externally and it may ask “Do you really want to delete it? This will break References.”

4. Yes or No, it does not matter. The Editor will now hang forever with “Updating Asset References”.

Some notes:
Loading both the provided Sequence files into memory brings back correct behavior.
Deleting either Sequence file also brings back correct behavior. Strangely, they are both needed to trigger the bug.
There are no circular dependencies in the files, but the buggy code exhibits a circular hang with low CPU and Disk usage. This is not related, but the Sequencer is storing garbage references to unused levels from previously possessed actors that are now deleted or replaced with actors from new levels. Reference Viewer is now showing these orphaned links to older levels at 4.18 while they are completely hidden and uncleanable from the UI. This bug also happens with Sequence files without the old orphaned level references. It is also triggered with references from other levels, and not just Sequences.

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