Error 404 on GET https://jira.xxxxxx.xx/plugins/servlet/gadgets/error/spec-not-found which is a known Jira error for all addons, not just Tempo. Please try the following steps:
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Uninstall Tempo
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Remove the Gadget from the Dashboard
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Reinstall Tempo
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Insert the gadget again
Error in atlassian-jira.log:
[c.a.g.embedded.internal.GadgetUrlBuilder] GadgetUrlBuilder: could not parse spec at rest/gadgets/1.0/g/is.origo.jira.tempo-plugin:tempo-user-timesheet/gadgets/tempo-user-timesheet-gadget.xml