several apps having errors with permissions

[AC Question]

Got a refurbished galaxy s3 a couple of weeks ago. Since then I've noticed a number of apps haven't been working correctly and after further investigation it all seems to be centered around file permissions. The example I'll use here is with the Amazon Appstore. I've gotten a few free apps from the Amazon Appstore, but I haven't been able to install any of them. It always returns with the nonspecific error message "There was an error while downloading <app name>. Please try again.", but of course "try again" never works. I tried uninstalling and reinstalling the app to no avail. Then I learned about an app called LogCat which can read system log information, so I got that to try and see what was going on and I found this:
"/storage/emulated/0/Android/data/com.amazon.venezia/files/apks/8591791b-233c-431d-beb5-055cd0f8c591.apk: open failed: EACCES (Permission denied)"

After browsing around a bit I see that there is no "apks" directory inside of "files". In fact "files" is completely empty, so my assumption is that the app isn't getting permission to create the directories/files that it needs to. Apparently my phone is already rooted (go refurb phone!) so I took a look at the app directory permissions:
"drwxrwx--- u0_a191 sdcard_r 2014-07-24 16:52 com.amazon.venezia"

Unfortunately I'm somewhat new to android so I'm not sure what the permissions are supposed to look like. Could anyone with more experience tell if this looks correct?