Create a new thread as asked here: 4.10 memory leak - AI - Unreal Engine Forums
Memory leak was caused by a widget component inside a blueprint. Memory leak starts when blueprint placed in the level, or just opened in a new tab\window(Loaded into memory basically)
For test purposes I test it on 4.9, and 4.10. Both versions get the same results.
Repro steps:
- Any project will do but you can create a new one.
- Create a new UMG.
- Place a Text(Not TextBox, I did not test it with TextBox)
- And change Text to " "(Not empty, a single space character)
- Then Create Blueprint.
- Add Widget component to it.
- Set widget class to our previously created widget(with " " text).
- Place it anywhere in the level, memory leak should start any moment(Usually 10-60 secs).
I hope you will get the same result, it was really annoying bug.