I have experienced the bug with priority frame disappearing and fps dropping to 0 for few sec aswell, it happens on Lord Jaraxxus, Ignis, Kologarn and Yogg Saron encounters. After doiong some research with error&taint logs I think I have identified the problem - functions "TidyUpAfterCombat()" and "StartCombat()" that are supposed to launch when entering and leaving vehicles(lines 876 & 881 in ShockAndAwe.lua) are starting when you are grabbed in some way during fight(such as it occurs at Ignis, Kologarn & Yogg). Haven't had the chance to test it yet but I belive that just commenting out lines 876 & 881 should fix the issue by just disabling the automatic hiding of bars in vehicles until Levva provides us with a proper workaround.
There have also been some bug with the "UpdateBindings()" function in this addon for quite a while that luckily doesen't do anything serious in game but spams the addons taint quite rapidly. I have commented those out for myself and everything seems to work good enough without them.
In case it helps, an example of an entry I'm getting in taint log:
Code:
8/27 22:14:00.063 An action was blocked in combat because of taint from ShockAndAwe - ClearOverrideBindings()
8/27 22:14:00.063 Interface\AddOns\ShockAndAwe\Bindings.lua:123 SetBindingKey()
8/27 22:14:00.063 Interface\AddOns\ShockAndAwe\Bindings.lua:109 UpdateBindings()
8/27 22:14:00.063 Interface\AddOns\ShockAndAwe\ShockAndAwe.lua:1152 TidyUpAfterCombat()
8/27 22:14:00.063 Interface\AddOns\ShockAndAwe\ShockAndAwe.lua:876 ?()
8/27 22:14:00.063 Interface\AddOns\ShockAndAwe\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:146 method()
8/27 22:14:00.063 safecall Dispatcher[7]:4
8/27 22:14:00.063 xpcall()
8/27 22:14:00.063 safecall Dispatcher[7]:13 ?()
8/27 22:14:00.063 Interface\AddOns\ShockAndAwe\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:91 Fire()
8/27 22:14:00.063 Interface\AddOns\ShockAndAwe\Libs\AceEvent-3.0\AceEvent-3.0.lua:119