not sure when or how but each time I open a project and start pie session the trace recording is automatically started
anybody knows how to turn it off?
bump, it’s driving me nuts 
happens only in one project
Any luck with that @laggyluk ? One of our dev started getting the same behavior yesterday, totally unclear why. Tried launching with -traceautostart=0 and it still auto starts.
I was having the same issue and it was driving me nuts. Not sure what weird keybind toggles that.
I was able to resolve it by deleting the cached config folder:
“YourProject”/Saved/Config
Recompiled after that and it stopped. Maybe give that a try @laggyluk @Ben_Herve
renamed the trace server exe 
For me this issue was caused by the Rewind Debugger’s “Automatically start recording when PIE is started” toggle:
Deleting the Saved/Config folder fixes the issue because this setting is stored in the EditorPerProjectUserSettings.inifile:
[/Script/RewindDebugger.RewindDebuggerSettings]
bShouldAutoRecordOnPIE=True
Not sure why the Rewind Debugger has this behaviour, might be an engine bug.