Thanks, Jeff! Can you please double-check to make sure you are on the latest version (2.1.4.6). This was a tricky bug that had been lurking for a while now and we finally isolated it and release an update to fix it a couple days ago. However, if you're on 2.1.4.6 and it still isn't fixed we definitely want to know that and dive deeper into why. Please let us know either way!
Here's the description from the last release notes:
2.1.4.6
Fixed critical bug that was causing incompatibilities with some plugins that install their own tables to the database and in some cases the cloning operation was leaving a single custom table behind in the clone. This primarily affected Calendar plugins or other plugins where the table name began with higher letters (a, b, c) after the prefix like wp_a*, wp_b*, wp_c*
Many thanks!
NS