I've actually never seen this issue before... I've allocated plenty of space to APC (64M), and there are some fragmentations according to the detailed usage and fragmentations... But the pie chart, wow, looks crazy! I've tried increasing the space (was 32M, it never used that much), and didn't seem to help. I've tried restarting Apache, and the problem comes back after an hour or so. Does anyone have any idea what may be causing this, and how can I make the data make more sense?