I have deleted the log file because it contained data from a couple of days ago. As soon as it repopulates I will post it here.
To explain the issue a bit more…
The CP and all domains are working normally.
However, when I go to the Tools and Settings page, the page loads immediately but then a “loading..” icon appears and the page layout reformats from a 3 column display to a 4 column display after a couple of seconds. None of my other plesk boxes do this.