I created a new website in January. It's a Xenforo forum. Last week I changed hosts. As soon as I changed hosts, I was no longer able to attach/upload files to posts. None of my users can either. The error message contains no detail (failed to upload file). File type and size are fine. I haven't changed permissions. My new host was able to create a new user and upload files successfully. As far as I know, they are the only ones who can. The host suggested cleaning my cache. I tried this to no avail. Xenforo thinks it's either a browser extension or cash issue. I'm running safari. As far as I know, I don't have any browser extensions (I'm a novice). Any suggestions would be appreciated.
This has been resolved. It turned out to be a problem with the host; file upload script was matching their security script, or something like that.