Hi,
I know that this plugin is not made by Revive Adserver, but after checking the sample file they are offering on their website I found what is wrong with time zone.
Instead of using -4 you should use -4:00
Check if you have an Ad blocker module installed in Firefox. Your Adserver is not loading Adsense ads quickly, it records the impression but users leave your page before the ad loads actually. Have you added any specific restriction to banners ? What's the type of that campaign ?
At the moment there is no Official SDK for native mobile apps from Revive, but I saw few on Internet paid and free. You need to integrate the SDK for each type of OS (Android , iOS ...). Mobile marketer depends on the type of app you are developing.
I guess this can be done using API. There is a function called generate tags in zone file. Check it and please let me know if this worked with Asynchronous tags.