While trying to upgrade my project from 5.3.2 to 5.6, all blueprints related to Sequencer cause a crash during project startup with the following error:
Considering that 5.6 has just released, it is still prone to unexpected issues. Since the problem only occurs with that version, I would test with migrating your project contents to a clean, 5.6 project. As well, please perform a cache refresh, via deleting Saved, Intermediate, and DerivedDataCache folders.
You’re very welcome, and thank you for your reply! Yes, I’m aware that the engine is still quite new, but it’s frustrating that I was able to upgrade to 5.5.4 without issues, yet I can’t do the same with 5.6. As you suggested, I tried with a clean cache and even attempted merging into a fresh 5.6 project—but no luck. I’m still getting the exact same error.
From what I can tell, the blueprints causing the crash are somehow related to Sequencer. What’s even stranger is that I still get the error even if I completely clear out the blueprint’s content—unless I delete the blueprint entirely.
If I remove the pre-defined maps from the config and let the engine load into an empty level, I can open the project. However, I can’t even rename the problematic blueprints—let alone open them. As soon as I try, the same error appears again and causes a crash.
