I was having the same problem with Foxfi not working with ice cream sandwich. I downloaded the new version 1.91.3 apx file from foxfi.com (
FoxFi Installer) to my phone and had to follow the instructions on the foxfi website to install it and now it works perfect with ice cream sandwich on my droid 4. Thank you very much for you post.
Installation instructions (for Sprint/AT&T Users):
1. Make sure "Unknown Sources" is checked in phone Settings (under Applications or Developer).
2. Tap on the following links to download the apk file for FoxFi.
3. From phone notifications select the downloaded file. This will install FoxFi.
FoxFi latest version: 1.91.3