Are you talking about the Magnus questline...? I think I ran into the same problem - you have to go into the second floor of Treglow's lab (the portal that has the science beakers over it) - just keep progressing through the maps until you get a lightbulb. They shortened the quests in these areas, but in the process left these open gaps where nothing happens and you're not notified of anything in the quest log/in progress tab.
I really don't understand why did they decide that removing the old Useful Items was a good idea. In what way does time restricting these items help? All it does is cause problems to players. Stop harming your players Nexon.
My theory is they're slowly trying to kill the game, as they can't justify outrightly shutting it down, so they add all these tiny annoyances patch by patch, which will slowly and surely alienate their entire playerbase.
I don't remember seeing this in the patch notes or anything like that, so this is likely good info for a lot of people. Going into the Cash Shop no longer auto-claims your RP for you - you need to press the refresh button located near the bottom in order to claim any RP. It also possible seems like RP is no longer shared across characters, as I was able to claim RP on my main, and then different RP on my Thunder Breaker where I collect my monster collection rewards every day.
Not sure why these changes were made, but just as an FYI to y'all who may be wondering.