# SceneComposer Known Issues

Due to enabling tree virtualization, some problems might appear:

<div class="contents" id="bkmrk-vertical-scroll-bar-"><div class="textblock">- Vertical scroll bar changes its size randomly and doesn't remember sizes of elements after viewing the whole tree. Scrolling with mouse is hard.
- After some scrolling up and down, the application might freeze, especially in hierarchies with many levels.

</div></div>---