"App not installed" & cannot restore apps with Titanium Backup

This has been annoying me for awhile now. I am running a Lollipop ROM on my OnePlus One, and I have not been able to install any apps by opening their APKs to install directly. It worked fine before (shortly after a fresh install), but now every time I try to open an APK file to install, I get "app not installed" as soon as I click the install button.

I can install and update apps through the Play store just fine. I have plenty of space free for new apps to be installed (more than 10 GB), and I have already allowed installing apps from unknown sources under settings.

I also just found out that Titanium Backup wouldn't restore any of my apps. My current install is still relatively fresh, with some apps restored through Titanium Backup (before it stopped working along with APK installing). I would like to know the cause of this, and I don't want to reinstall just so this will happen again.

Show Accepted Answer

Guest Quick Reply (No URL, BBcode or HTML)

Last post by ledner.jessyca
1 hour ago
Last post by jake49
4 hours ago
Last post by micaela66
47 minutes ago
Last post by matt17
1 hour ago
Last post by murphy90
3 hours ago
Last post by akoss
1 hour ago
Last post by smosciski
18 minutes ago
Last post by jacobson.bertrand
3 hours ago
Last post by sallie61
53 minutes ago
Last post by ratke.candice
2 hours ago
Last post by xgrant
4 hours ago