After the version upgrade the other day and this morning, I got a “Cannot modify headers” error in the admin dashboard. It didn’t cause any other problems on the website itself, but I was able to remove this error by making sure there was no lead space in the functions.php file of the parent theme. The first time this happened, there didn’t appear to be extra space at the beginning of the first line. But I put the cursor there and backspaced anyway then saved the file again. Error was gone after that. Same thing with this morning’s update, but this time there was visible space before the first character in the functions.php file. Deleted that space and the error went away. Is this the same problem you’re having?
