Hi there,
I have just had the same thing happen to me. I’ve tried most of the above, including renaming the folder(s) and uploading older versions, deleting folders and nothing is working.
I’m going to have to hire someone to do the more delicate troubleshooting suggested above, because it’s beyond my capability/comfort level. I’ve got a call into him now.
I love my Events Calendar; if there is something I can share to help figure out where the incompatibility is happening, please let me know. I don’t want to worry about updating in the future.
I’m using X Theme, in case it matters.
Thanks.