Tried to log onto DMU for the first time in a while this morning and it told me my Forge version was outdated... It said I needed to get update 1.12.2 - 14.23.5.2857, so I updated to the latest version (1.12.2 - 14.23.5.2858) and its still outdated?! How can the latest possible version be too old??

Screenshots

Make sure you also create a new minecraft profile with that new forge installation, and launch that.