I wouldn't think upgrading from 1.6.1.20 to 1.6.1.24 would be a big deal, but it broke all my category pages. Everything except the homepage gets an error 500.
This is not the same as other folks reporting this problem with a 404 error. I am not using an SEO module that removes the category number. My category pages aren't missing - they are generating a 500 error, not 404. Product pages work fine - this only affects the category pages.
Note that I can see all the categories in the back office just fine.
I am using the default prestashop theme. Configuration of top menu looks normal. I tried adding an existing subcategory to the top menu and that link also failed with a 500 error.
I also tried disabling and re-enabling friendly URLs and clearing the cache under Performance. No change.
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