[TYPO3-english] Feeditadvanced with typo 4.6.3 - Editor not being loaded

[Chris Hodgkins]

Anyone using Feeditadvanced successfully with typo 4.6.3?

Here I'm seeing the "Edit Content Element" popup, Content Element, and
Header type/fields are populated successfully, but the Rich Text Editor
never loads: I just see "The editor is being loaded please wait ..."

The log has stat failures such as:
Core: Error handler (FE): PHP Warning: filesize(): stat failed
for /var/www/websitename.xyz/typo3temp/rtehtmlarea/htmlarea_cumulative_8f280622c58aed6763aa_compressed.js in /var/www/typo3_src-4.6.3/t3lib/class.t3lib_compressor.php line 461

Backend editing works as expected.

cheers