It may be an issue with the ALE files. I encountered a similar issue in a 4.5 installation about a year ago. Users were unable to view ship to codes when using the ALE. Issue was resolved by renaming the ALE files and reinstalling the modules. You can also try restoring the ALE files from the last known good backup prior to the occurrence of the issue. ALE files are in the SOA folder. They are SY1Q01, SY1Q02, SY1Q03, SY1Q04, and SY1QDD.