Editor hangs on specific Animation Blueprint asset (included)
Branch: Binary build from the Unreal Launcher
Build version: 4.9.2-2707645+++depot+UE4-Releases+4.9
Today I was playing with Animation Blueprint asset and was in constant edit->run-to-test cycle. After one of such edit iteration on Event Graph of that Animation Blueprint, I press Save and then rapidly Compile. That cause editor hang and constant increase of memory use by editor process. After a bit of waiting I kill the editor process via the Task Manager and try to reopen the project. Project was successfully loaded but editor hangs again right after loading with the same behavior: UI is not responsive in any way + constant grow of used memory. Suspecting that that Animation Blueprint asset become the cause of problem, I move it manually to another project and try loading this project. Project was successfully opened and no problem were observed. I was able to open that suspected Animation Blueprint and there are was compiler error reported due to missed Blend Space referenced by this Animation Blueprint. I delete this missed reference node from the graph, press Save, Compile and got exactly the same hang behavior as in original case. So the problem seems to be really in specific content of this asset after my last edit operation (added some nodes and reroute some pins).
"version1" included in attached archive is the initial version of problematic asset
"version2" included in attached archive is the version of problematic asset opened and changed in another project (to fix the compiler error)
Apologies for the late reply. I have entered UE-22655 into our system after reproducing the issue. Thanks for reporting this...and watch out for those endless loops!!
answered Oct 27 '15 at 06:29 PM
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