Hi Atharstar,
Yes it is working on 4.15.1
check again your proguard additions, add the following, copy from here and paste them to AdColony_APL file:
For communication with AdColony’s WebView
-keepclassmembers class * {
@android.webkit.JavascriptInterface <methods>;
}
For removing warnings due to lack of Multi-Window support
-dontwarn android.app.Activity