Oddly, after seeing your posting I tried the Samsung browser, which used to be error-free. In my case, all the initial load layers showed 'OK' and the ui3 page loaded fine. I then went to Settings to see what version of Samsung software I had (1202 as I recall). Then when I went back to the browser, there was an error pop-up:
"Information
An unexpected error has occurred in /ui3.htm (v 70 / 4.8.6.3).
A full refresh may solve the problem (CTRL+F5). If you wish to
report the error, please SCREENSHOT the browser now.
Uncaught ReferenceError: vc_request_action is not defined
at [1.1]
Mozilla/5.0 (SMART-TV; Linux; Tizen 4.0) AppleWebKit/537.36
(KHTML, Like Gecko) SamsungBrowser/2.1 Chrome/56.0.2924.0
TV Safari/537.36"
After clicking OK, the error moved to a red box in the lower right.
After clicking into that red box, it went away. It's still okay after 10 minutes.