The only similarity between configurations across sites/servers that are now not working, is they all have PHP 7.4.33 I dont actually know if that was updated recently or not, however, two servers ae managed by different companies (in different countries) so I expect it unlikely they both happen to have seen an update the same night to the exact same version. Otherwise, nothing I see on my end points to an issue I have inadvertently created. Does F2PDF use its own server (such as AWS or similar) to process or is it all on the host server? desperate for a solution.