What steps will reproduce the problem?
I'm not sure when it's triggering, it's showing up in BugSack

Do you have an error log of what happened?
33x [ADDON_ACTION_BLOCKED] AddOn 'ACP' tried to call the protected function 'CompactRaidFrame1:ClearAllPoints()'.
!BugGrabber\BugGrabber.lua:573 in function <!BugGrabber\BugGrabber.lua:573
[C]: in function `ClearAllPoints'
FrameXML\FlowContainer.lua:157 in function `FlowContainer_DoLayout'
FrameXML\FlowContainer.lua:17 in function `FlowContainer_ResumeUpdates'
...actRaidFrames\Blizzard_CompactRaidFrameContainer.lua:185 in function `CompactRaidFrameContainer_LayoutFrames'
...actRaidFrames\Blizzard_CompactRaidFrameContainer.lua:130 in function `CompactRaidFrameContainer_TryUpdate'
...actRaidFrames\Blizzard_CompactRaidFrameContainer.lua:57 in function `CompactRaidFrameContainer_OnEvent'
[string "*:OnEvent"]:1: in function <[string "*:OnEvent"]:1>

Locals: