I just checked my computer doing everything you tested out and it worked fine for me. I also reloaded my game file just to check if a version update is the problem.
That's weird that even after deleting cookies and everything you still have the problem. Did you try running a program like CCleaner, or reinstalling/reactivating Flash on your browser?
I can put a notice on the fan forum and see if Mateusz Skutnik has any possible explanation for this.
Error 3113 (talk) 22:03, May 11, 2016 (UTC)
Yup, Pastel world is still as alive as its ever been since the switch. Make sure everybody knows :D