Rofl, I worked as a programmer for 7 years. One problem was on going for 6 months. We could never replicate it. All we could do was correct the data every time it happened.
But just to make sure. You are downloading the optional patch for the professions plugin ? It isn't the same as the actual addon. You need to click on the other files tab on the addon page and download it from there rather than the main addon page.
If it is still a problem even with the new patch file then there must be something that was missed that isn't consistent.
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