There’s a weird, undescriptive error you might come across if you use the CMS editor in PrestaShop.  It will say “an error occurred while updating object cms ()”.  That isn’t very helpful.  It turns out that there are some “taboo” words that aren’t allowed to be used.  It looks like it’s there to prevent sql hacking.  If you get this error, check your content for the following words and replace them with something different: union, load_file, outfile, dumpfile, escaped, terminated, cascade, infile, x509, trigger, revoke