Quick Titler window position is kept in registry. Attempt to delete it. 

1) Quit EDIUS if running.

2) Press Win + R key.

3) Type regedit then click [OK].

4) Select [HKEY_CURRENT_USER] > [Software] > [Grass Valley] > [Quick Tiler] > [EDIUSVER#] > [QuickTitler] in the left-pane.
* See below matrix to identify the EDIUSVER# value should be selected

5) Right-click on WindowPosition under QuickTitler entry in the left-pane and then select [Delete].

6) Restart EDIUS and then open QuickTitler.