Thank you guys for trying it!
I have uploaded the new version. Check the first post in the thread. It should give you no more errors. All preferences are stored and recalled to/from the ExtState.
@Gianfini:
I will make a "reset to default color" function (done!).
I will look if I can import .SWSColor files too. (done!) Palette history.. I don't think I need it..So, no plans for this.. Open the standard Windows color management tool.. If I implement opening of .SWSColor files, then this is not needed as well. Plus, I am afraid that it is too difficult to implement for my knowledge