Regarding the changes to LoMM: Before the patch, players in REDQ who could not meet the minimum required stats (e.g. 120k power for DPS) would often abandon game at the start because they knew how this will go down during the mimic/golem/coccoon phases. After this new patch, however, they might adopt a little more…
Same thing happened to me after returning from a 2.5 year hiatus. The Seals of the Brave were introduced in Port Nyanzaru, I think. They have since been removed from the regular Seals Trader's currency exchange due to now being outdated (as you've seen). Have you checked in Port Nyanzaru to see if there are any vendors…
Same thing has happened to me. I have requested help through a support ticket on the site, as recommended above by a community moderator. Just make sure someone knows that you've had this problem at least. I hope this gets resolved soon for us both - and others too.