I've installed Simple Image Gallery on my site, and it works great except for a few menu items don't work (breadcrumbs and another one just above breadcrumbs). These links work on all other pages of the site -- I've even deleted gallery to see if they work, and they work when the gallery is not there. Do I need to upgrade to the Pro version? I've included link to the page with gallery below. I appreciate any help with this!!

www.wespeak4kids.org/index.php/casa-supporters/corporate-partners

I think it will be right to upgrade it to Pro version . Pro version works much better .

I am afraid that there is no solution if there is a conflict between SIG pop up and the menu dropdown, other than use SIG PRO which has many pop ups to select from in order to avoid such conflicts.

However, you should verify that the conflict comes from SIG by disabling it and checking the menu functionality.
If this is the case you should use SIG PRO.