SeaMonkey 2.28. I force Flash on YouTube, and with 2.6.8.38rc1 I don't get any opportunity to allow the embedded Flash object.
In 2.6.8.37rc2 I would get a placeholder I can click and an entry in Blocked Objects submenu.
Seems there's nothing related in the Error Console.
URL: https://www.youtube.com/watch?v=b-1W7q0FuaA
Only "www.youtube.com" is Allowed
[FIXED] (Regression) Can't View YouTube Videos
[FIXED] (Regression) Can't View YouTube Videos
*Always* check the changelogs BEFORE updating that important software!
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:31.0) Gecko/20100101 SeaMonkey/2.28
- Giorgio Maone
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Re: (Regression) Can't View YouTube Videos
Please chek latest development build 2.6.8.38rc2, thank you.
Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0
Re: (Regression) Can't View YouTube Videos
Fixed, thanks 
*Always* check the changelogs BEFORE updating that important software!
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:31.0) Gecko/20100101 SeaMonkey/2.28