WowAce

Not sure how long this has been a problem. Long since I levelled a character.

The last 2 levels I've gained caused the game to freeze until the the script loop breaks and gives the following error:

1x ...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0-7.lua:30: script ran too long
[string "@Ace3\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:30: in function <...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:25>
[string "@Ace3\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:64: in function `Fire'
[string "@Ace3\AceConfig-3.0-3\AceConfigRegistry-3.0\AceConfigRegistry-3.0-20.lua"]:291: in function `NotifyChange'
[string "@Bartender4\libs\LibDualSpec-1.0\LibDualSpec-1.0-20.lua"]:443: in function <...\Bartender4\libs\LibDualSpec-1.0\LibDualSpec-1.0.lua:412>

Not sure why only the last 2 levels. And none of the previous.
The first time I gained a new ability as I levelled, and it happened as we finished a dungeon and I got the autocomplete XP reward.
The second time I handed in a dungeon quest. No new abilities learned.

Only thing in common is that I was in a dungeon both times.

To clarify. This is on Retail

For the time being, I've commented out line 423 (LibDualSpec-1.0) to stop the freezing.
Not sure if that creates any issues somewhere else. But at this point, that workaround functions for me.