I've just installed v. Workflow 2010 on our test system - version 126.96.36.199 (a little out of date, I know, but want to replicate the live system). I tried activating it in "Site collection features", in a newly-created site collection, and an "unexpected error" message was displayed in the browser.
Extracted the log lines for the given correlation ID, which included the following:
- Feature Activation: Activating Feature 'NintexWorkflowContentTypeUpgrade' (ID: '86c83d16-605d-41b4-bfdd-c75947899ac7')
- Failed to look up string with key "SiteCollectionFeature_ImageUrl_2010", keyfile NWResource.
- Localized resource for token 'SiteCollectionFeature_ImageUrl_2010' could not be found for file with path: "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\Template\Features\NintexWorkflowContentTypeUpgrade\feature.xml".
I've checked, and the feature.xml file is present (and apparently identical to the file on the live system). I've tried restarting the application pool, to no avail.
Has anyone seen this before, or any suggestions for further investigation?