Sometimes you might see the L2 Store (in-game store) window but are unable to click or otherwise interact with it. This happens when the actual store window ends up being located off-screen. The window you're seeing is a “ghost” image. To fix this, please do the following:

1. Go to your Lineage II/System folder.
2. Delete the "Windowsinfo.ini" file.
3. Launch the NCLauncher and perform a file check/repair on Lineage II.
4. Log into Lineage II and press the key combination Alt + Shift + O to bring up the Options menu. Click the Reset Window Location button.