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I think the problem is there is no upgrade script ti change your tables in the database and move the data to the new tables. If you can delete version 2.07 and re upload version 2.01. See if you can access and save your data. Then uninstall the module as in this
Flash Tutorial. Check the database and make sure all wf-section tables are removed. Then do a clean install of version 2.07 beta. Then you would probably need to manually copy and past any content that you desired to save, or start completely over.
2.07 is a beta and is why no upgrade script is included, it may change more before final release and was not intended for production sites. But I do use it on mine with no problems.