#1 I have no idea what version 1.10 is. Assuming you mean 2.10 you're still behind. The currently supported release is 2.11.1. (Unless you time traveled down some internet archive rabbit hole and dug up a 1.1.0 release from like 12 years ago.)
#2 I have no idea why you're getting Save as dialogs in Firefox, likely because your app isn't sending the proper Content-Type on the responses. You could try disabling the DOM XSS rule and see if you get past it. (Since it's the only active scan rule that uses a browser.) If that doesn't do it, then it's something with your Selenium usage.