It’s just straight up broken no matter what mesh I use, this is all default parameters.
‘Any mesh, default parameters, straight up broken’ — the actual error is in the log, but Solve Body failing universally is almost always one of these:
- Wrong input type: Solve Body works inside the MetaHuman identity pipeline — it expects an imported MetaHuman character/scan with its frames data, not an arbitrary static or skeletal mesh. Running it on a non-MetaHuman input fails every time by design. If you’re starting from a random mesh, it needs to go through the MetaHuman import/identity flow first.
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- Plugin version mismatch: in 5.8 the MetaHuman stack is split across plugins (MetaHuman Core Tech, MetaHuman Character, etc.). If some are from an older install or the Fab install didn’t pull the matching set for your engine version, Solve silently no-ops or errors. Edit > Plugins: check every MetaHuman* plugin is enabled and re-install the bundle from Fab so all versions match your engine build.
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- Read the real error: Window > Output Log, filter ‘MetaHuman’ — missing frames, identity mismatch, entitlement problems, they all get logged there while the UI just reports failure. The exact line narrows this to one cause.
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- Baseline test: grab the MetaHuman sample content and run Solve once on it. If the sample solves, your input data is the problem; if the sample also fails, it’s the plugin install.
- If none of that lands, post the LogMetaHuman lines here — the specific message will pin it down.