If there is a "-M" next to the build, it denotes that it's a "military" or "offline" file version.
We notify you that your Periscope JAR is out of date with an exclamation point icon at the bottom of the dashboard.
Deploying the jar using the plugin was straightforward.This varies according to the browser your using (Chrome, Firefox, IE, etc.) and you can find detailed instructions for each browser at It's not a bad idea to clear your cache on occasion to capture any recent adjustments that we've made to Periscope. However my attempt to update the JAR doesn't seem to be working.
The task seems to run OK, but the JAR doesn't get updated.Often times prior to a full release Jens and the Mojang team will release snapshots or pre-releases.