Perform the steps below to reset the .LAY files:
1) Fully exit ALL of Toad.
2) Go to:
XP:
C:\Documents and Settings\<YOUR_USER>\Application Data\Quest Software\Toad for Oracle\11.6\User Files\
-OR-
Vista or 7:
C:\Users\<YOUR_USER>\AppData\Roaming\Quest Software\Toad for Oracle\11.6\User Files\
3) Rename the following files:
a) EditorDesktopLayout_PLSQL.lay to EditorDesktopLayout_PLSQL_OLD.lay
b) EditorDesktopLayout_SQL.lay to EditorDesktopLayout_SQL_OLD.lay
c) MainFormLayout_default.lay to MainFormLayout_default_OLD.lay
4) Start Toad and re-test the issue.