Got this upon entering a dungeon while the group was in fight:

1x [ADDON_ACTION_BLOCKED] AddOn "oUF" tried to call the protected function "oUF_Rain_PartyPetsUnitButton2:SetSize()".
!BugGrabber-r188\BugGrabber.lua:587: in function <!BugGrabber\BugGrabber.lua:587>

oUF_Rain\oUF_Rain-pre alpha.lua:266: in function "styleFunc"
oUF-1.6.0\ouf-1.6.0.lua:262: in function <oUF\ouf.lua:192>
(tail call): ?
(tail call): ?
FrameXML\RestrictedFrames.lua:721: in function <FrameXML\RestrictedFrames.lua:713>


FrameXML\RestrictedFrames.lua:740: in function "CallMethod"
[string " local header = self:GetParent()RestrictedExecution.lua:441: in function <FrameXML\RestrictedExecution.lua:412>
FrameXML\SecureGroupHeaders.lua:108: in function <FrameXML\SecureGroupHeaders.lua:102>
FrameXML\SecureGroupHeaders.lua:158: in function <FrameXML\SecureGroupHeaders.lua:115>
FrameXML\SecureGroupHeaders.lua:458: in function <FrameXML\SecureGroupHeaders.lua:382>

FrameXML\SecureStateDriver.lua:100: in function <FrameXML\SecureStateDriver.lua:95>
FrameXML\SecureStateDriver.lua:127: in function <FrameXML\SecureStateDriver.lua:119>

Locals:
nil

for all party, party targets and party pets frames. Didn't seem to loose any functionality though as far as I can tell.

P.S: Hey, we have a nice 💯 here :)

You can't call :SetSize() on a header frame. You have to do this through 'oUF-initialConfigFunction'.

you were right