this link from generalspecialist.com gives several tips for dealing with image buffer errors.
it would help to know a little about your system, like how much ram you have, what os you are using and what ae version… since i don’t know what your original settings were, here are some basics i’d suggest… set the max memory to 120% (if you have less than 3gb of ram, you can go higher, but don’t exceed 200%). set the max ram cache to 60% (you’ll rarely ever want to go higher, but you can lower this to try and increase the ram available for image buffering, you might try 30%, just to see if that clears up the error, then increase it some to see if the error comes back).
the disk cache seems fine for sd projects, you can increase it if needed, but you would like to choose a drive for the cache that is on a separate controller from your media… so if you have your media on a firewire drive, try choosing the main drive for the cache (this is mainly for performance reasons, so if you only have one drive you will be ok).
disabling opengl in the previews pref can help clear up some ram… images rendered by opengl acceleration get buffered to ram before getting rendered, so they take up some space.
choosing edit>purge>all prior to rendering can also help free up ram.
Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW