I have been having a similar problem, apparently after one of the recent updates it appeared as though I could not see new posts in threads. what was happening as best I could figure out was while viewing threads in hybrid mode after a certain number of replies the small window at the top of the page would say "more replies below current depth" I could not view those replies unless I clicked on "more replies below current depth".
The replies would then show up in both the window on top and below, but just the replies "below current depth" would show below.

It does make the hybrid mode a little confusing.

I don't know if this is what is going on with Texas Grass but I thought I might chime in with a possibility.