Howdy yorkshiretots,
That is strange. I have not seen anyone with a similar issue before, and certainly not experiencing that on my sites.
Could you try disabling your other plugins as well, except The Events Calendar, Pro, and Community? Does that fix it? If so, then it is likely that Community and on of your other plugins are no getting along. You could try reenabling them one at a time until you find the culprit. If disabling the other plugins does not fix your issue, then likely one or more files on your server has become corrupted. Personally I would delete all Event Calendar plugin folders, download fresh copies, and extract them into your plugins folder. If that does not work I would then try reinstalling WordPress from a fresh copy, then importing my old database. Of course, before doing any of this making a full backup is quite advisable.
I wish there were an easier way, but you have yourself a very unique problem. Generally this results from a very unique malfunction, like a corrupted file or a rare plugin conflict.
Please let me know if you have questions. Did following those steps fix it for you?
– Brook