XF 1.5 Create Thread / Edit admin area - nothing happens but date timestamp

PJK

Active member
Yesterday I was editing one of the widgets, and when I clicked save the page would reload with a blank white page and a time stamp at the top with the date and time. Today a user said they tried to a create a thread and the same issue happened:
http://imgur.com/a/reTPt

I'm unsure how often this is happening or why it is happening, nor when it started. First I noticed it was yesterday. How can I troubleshoot this?

Thanks.
 
I suspect this issue is actually not related to that Widget plugin. The user who reported the same error when creating a thread said when they changed the text in the post, the error went away. But if they post with the same content as before, that error keeps happening.

What's the best way to troubleshoot this? Any advice is appreciated.
Thanks.
 
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