You guys are amazing! I can confirm that both the issue and the fix hold true not just when using the OSC Plugin, but also when using the OSC Protocol plugin for Remote control. This was driving me absolutely bonkers for not even being able to receive simple OSC messages on localhost. In the case of Remote Control OSC, using “0.0.0.0” in the relevant section of the project settings fixed it. Hopefully this will be sorted in UE 5.5.2
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