I get on several installations frequently the following error (memory limit 64 MB):
Allowed memory size of 67108864 bytes exhausted (tried to allocate 19276 bytes) in /var/***masked***/roundcubemail-1.0.1/program/lib/Roundcube/rcube_image.php on line 164
Result: Image display fails.
IMO there should be a check/limitation not to pass large images to GD. Do any others have such issues?
May be this discussion is of help:
http://stackoverflow.com/questions/2827908/php-gd-allowed-memory-size-exhaus...