I cannot access my inventory or https://subeta.net/explore/luminaire/presents.php. Inventory became inaccessible after I went to get my presents. I keep getting a 504 error.

Something similar happened to me earlier when I was mass buying items from the New Years Shop for my collections. It's possible that you have a lot of presents under your tree and the page is trying to process them all (I saw you very active on the Luminaire forum :P). Perhaps try giving it some time and see if it fixes itself?

I am having the same issue :P

Not for me.

No longer having issues, thankfully. Tree presents page a bit laggy but that's to be expected when I got so many....but it eventually loads, so all's good