Hmm. It's slightly different now, although I'm not sure how different that is.

I can't seem to reproduce it reliably for testing versus other addons.

1x BlizzMove\BlizzMove-v3.3.0.lua:1030: Action[SetPoint] failed because[Cannot anchor to a region dependent on it]: attempted from: <unnamed>:SetPoint. [string "=[C]"]: in function SetPoint'
[string "@BlizzMove\BlizzMove-v3.3.0.lua"]:1030: in function ?' [string "@TomTom\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:119: in function <...Tom\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:119> [string "=[C]"]: ? [string "@TomTom\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:29: in function <...Tom\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:25> [string "@TomTom\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:64: in function Fire'
[string "@tomtom\libs\AceEvent-3.0\AceEvent-3.0-4.lua"]:120: in function <...aceTomTom\libs\AceEvent-3.0\AceEvent-3.0.lua:119>
[string "=[C]"]: in function LoadAddOn' [string "@FrameXML\UIParent.lua"]:544: in function UIParentLoadAddOn'
[string "@FrameXML\UIParent.lua"]:710: in function CollectionsJournal_LoadUI' [string "@FrameXML\UIParent.lua"]:1157: in function SetCollectionsJournalShown'
[string "@FrameXML\UIParent.lua"]:1151: in function ToggleCollectionsJournal' [string "TOGGLECOLLECTIONS"]:1: in function <[string "TOGGLECOLLECTIONS"]:1>

I've never seen that error myself, but some of the changes in the latest version might fix this
let me know if it does or doesn't

if it's not fixed, then try disable all other addons first, and see if the error is still there

Huh. If I actually open the collections, it says false (whether or not the error is thrown). But when I used it before opening anything...

1x [string "return CollectionsJournal:IsUserPlaced()"]:1: attempt to index global 'CollectionsJournal' (a nil value)
[string "return CollectionsJournal:IsUserPlaced()"]:1: in function `func'
[string "@SharedXML\Dump.lua"]:396: in function `DevTools_DumpCommand'
[string "@FrameXML\ChatFrame.lua"]:2411: in function `?'
[string "@FrameXML\ChatFrame.lua"]:5185: in function `ChatEdit_ParseText'
[string "@FrameXML\ChatFrame.lua"]:4849: in function `ChatEdit_SendText'
[string "@FrameXML\ChatFrame.lua"]:4885: in function `ChatEdit_OnEnterPressed'
[string "*:OnEnterPressed"]:1: in function <[string "*:OnEnterPressed"]:1>

Locals:
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to index global 'CollectionsJournal' (a nil value)"

I've also noted the same or similar error (as the original post) coming up when I click item/achievement links in the chat box.

seems to be similar to #87
can you tell me when you type /dump CollectionsJournal:IsUserPlaced() in chat, does it say true or false?

Just wanted to mention that the error you posted in previous comment is harmless, that simply happens because the frame only gets loaded on demand, so if you run the command given before opening it once it doesnt exist.