This problem seems to occur with any generated page size greater than 1meg.
It also occured with the Sales Report mod for large page sizes
The default memory size for php 4.4.8 was 8meg
The default memory size for the php 5.2.8 was also 8meg
Further reading at the php site say that the default for php 5.2.8 should be 32meg
As suggested above I used a custom php.ini file and changed the memory size to 32meg
No more problems :clap:
It seems that my host did not increase the memory size for php5 as they should have
Thanks for your suggestion.