“Cannot allocate memory buffer” messages indicate a shortage of memory allocated to frame buffering, so uncommenting the MemoryApplication keyword and defining an amount of memory for frame buffers can resolve this problem. The amount to set in this case depends on how much RAM your system has: start with 400 MB for Finishing applications or 700 MB for Visual Effects applications. Allocate more memory to frame buffers in increments of 50 MB as required.