Hi Scott,
Using a stock standard Decode v2.8.4, and viewing on a Kindle Fire (original edition), the sidebar is always open. It does not respond to the close X.
I know that the Amazon Silk browser is based upon Webkit, but I have not been able to reproduce the problem with any other webkit browser.
Unfortunately, I do get a fair amount of traffic on Kindles, so this is an issue for my site.
Any suggestions?
(If it were stuck closed, it would be less of an issue for me, though that wouldn't actually solve the problem.)
Steven