This will be fixed by SM in due course, but in the meantime here's a little hack in the form of Poser addon which should help.

It won't magically fix existing scenes where values have already been changed, but any future saved scenes will retain their proper settings when next loaded.

Note that this version only retains the settings for image map nodes. If there are other nodetypes that you need this to work for then let me know and if I have time I'll add support for them.

CAVEAT:
I saw this thread and threw the code together quickly, so it MAY contain bugs. In other words, use with caution and let me know if anything needs fixing :-)

Because it analyses the scene on saving and loading, and stores some extra data in the scene file, it may have a very small impact on saving/loading times. Scene file sizes may increase ever so slightly too.

NOTES:
Remove the '.txt' extension from the attached file and it will be a zip file with the addon inside.

Free stuff @ https://poser.cobrablade.net/