I've upgraded our test server from 8.5.2 to 8.5.3 and it took slightly under 5 minutes. Now that's what I call a good server upgrade (are you listening Microsoft???)
Anyway, so far, so good, everything seems to be working but then I haven't done a whole lot of testing yet.
My client took 21 minutes to upgrade from 8.5.2 to 8.5.3, which felt like a long time. It also came back a little weird and some views didn't populate immediately. Refreshing them made a big difference.
Again, so far, so good (mostly).
Unfortunately I lost the ability to click on a URL and have it launch my default browser (Chrome). Instead, it pops up Notepad (weird!!) and a bizarre little message.
The filename, directory name or volume label syntax is incorrect.
I'm on a 64 bit Windows 7 Professional PC and Chrome is located in;
"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe"
I've already checked my HKEY_CURRENT_USER\Software\Classes\http\shell\open\command key in the registry and it says;
"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" "%1"
The related keys look fine too.
If I switch to the browser embedded in the Notes client, it works, but then when I switch back to my Operating System's default browser, it opens Notepad.
I decided to make Firefox, then Safari my default browsers and they worked properly, then when I made Chrome the default again, somehow the problem got fixed.
It's a trap to look out for.