deleting the wincache? Yes, I did that .. it seemed worse after I did so, but that might be my imagination. I can easily choose to create a CSS Sculptor page, select any layout other than Cabo and the second I click on Customize CSS, I can see it change back to Cabo in the window. Every time.
Unfortunately, this makes the extension unusable and now that I find out it was a known issue, I feel a bit disgruntled that you are selling it anyway.
Feel free to put me on the testing team .. I have done this sort of thing for years on various products and extensions.
I believe there is only a 15 day window for a refund. Obviously, the issue needs to be fixed with ample time after the fix is finished for user testing before the refund window is closed. If such is not the case, refunds are definitely in order.