Hi Marc,
We created a cross-post in the technical problems as this appeared to be more than a general issues. Somehow that post has been deleted over the last several hours, unsure how, but there was a bit more information provided regarding the issue within that post.
There are only a few people who have access to those functions to push an update, none of which did so in this situation. It is believed this may have been some update from the hosting provider, but they have also remained unresponsive to our requests for assistance.
We have cleared the cache several times, as well as having tried recovery mode to fix the errors, all without any success. Reverting to the Invision theme and disabling custom items also has not fixed any of the issues.
As to the applications, when you say "disable" there is no option presented in our ACP for that, do you mean that we should uninstall those applications and reinstall them? We presently only run 5 applications (System, Forums, Calendar, Pages and PERSCOM) all of which are currently up to date (4.7.11.1). We had tried previously with disabling PERSCOM to see whether that was the issue, but the problems persisted.
Additionally, there remains an issue with the support tab as the loading wheels will spin indefinitely and never fully load to assess whether there is any issues on the site. I have attached a photo for reference.
Apart from the theme prompt issue, the text box within forum posts, both for creating new topics, editing, and replying presents as a small bar that is not able to be selected or typed within. I have also attached a photo for reference.