That's odd ...
Paul, have you received my reply to your second post? I sent it twice -to list- but did not receive a copy myself.
A copy below:
Hi Paul,
From my past experience with using plugins in a variety of image editors I know (or rather: was told) the hosts treat used memory of a filter differently: either at close down or at start up of a filter. Not all hosts clearing ALL previous data consistently has often caused the known "memory access violation" error.
Based on the fact described above I would say your only reliable alternative for storing data between filter sessions is using an external file to write to/read from.
Unless you find a lucky fluke in plugin handling with the image editor you use in particular, that is.
Roberto