When the spellchecker is invoked (F7), if the document contains no errors (eg if the document is empty), the Options button cannot be accessed since LibreOffice simply shows a message box saying "The spellcheck is complete" and immediately closes the spell check dialog without giving an option to invoke options, which could affect what is counted as an error.
I can approve this behavior in Version 3.6.3.2 (Build ID: 58f22d5). I think, the autoclose of this box should be disabled. The possibility, to write an error and after you could enter the menu is not how it should be. Greetings from Switzerland, Markus
*** Bug 61595 has been marked as a duplicate of this bug. ***
*** This bug has been marked as a duplicate of bug 42935 ***