Maximenu, mobile plugin and IE

Hi Ced,
I have a problem getting the mobile plugin to work on my new website (J2.5.9). It just doesn't appear when I make the window smaller. It is defined to show up after the width is smaller than 767px.
The second problem with maximenu is with IE 8 or 9. With 8 the logo is cut and the dropdowns do not work properly. With 9 the logo looks better, but the dropdowns still do not work properly. So far I developed with Firefox, but also Chrome and Safari looked OK so far.
Can I send you the URL with a PN or by email? I do not see the possibility of PN in this forum.
Many thanks
KP

Hi
you can send me your url here :
www.joomlack.fr/en/contact
CEd