Ah, yeah does seem to be a tvdb api update causing this https://forums.thetvdb.com/viewtopic.php?p=161046

Saw some other users with similar problems too. API currently unable to match anything past episode 100

Here's a screencap of the episodes screen, you can see where TVDB stops at 100 while MovieDB will return the whole series

https://i.imgur.com/p9gcB5e.png

So this just started happening to me today. When I try to match shows on TVDB, it won't go past the first 100 episodes of a series. This is in both the rename tab, and when I search for the show on the episodes tab. Using the moviedb as the agent will show the whole series. Not sure if it's related ...