Tried to submit this via the Feedback/Bug option, but for some strange reason there is a 500 character text limit, so not really sure how you can both describe the error, how to reproduce it and other info with that limitation.
So posting here instead.
Getting this lua error when having the achievement statistic window open during a bossfight:
1x …rd_AchievementUI/Mainline/Blizzard_AchievementUI.lua:2181: script ran too long
[string “@Blizzard_AchievementUI/Mainline/Blizzard_AchievementUI.lua”]:2181: in function AchievementFrameStats_UpdateDataProvider' [string "@Blizzard_AchievementUI/Mainline/Blizzard_AchievementUI.lua"]:704: in function AchievementFrameCategories_OnCategoryChanged’
[string “@Blizzard_AchievementUI/Mainline/Blizzard_AchievementUI.lua”]:623: in function AchievementFrameCategories_SelectElementData' [string "@Blizzard_AchievementUI/Mainline/Blizzard_AchievementUI.lua"]:628: in function AchievementFrameCategories_OnCategoryClicked’
[string “@Blizzard_AchievementUI/Mainline/Blizzard_AchievementUI.lua”]:456: in function <…rd_AchievementUI/Mainline/Blizzard_AchievementUI.lua:455>
Locals:
Skipped (In Encounter)