I updated to 1.3 as with the server.
At first, I thought it was because it wasn't a clean .jar
(It worked on other 1.3 servers).
If I travel a certain distance of where I spawned into the world. I can break blocks and walk through them, I cannot attack mobs or fire arrows. If I dropped an item, it wouldn't appear. Until I log out and in again. But I would be in a different place to where I was standing if I dropped the item.
It is not lag because I looked at /lag. 20 ticks.
For other people it just appears me to be standing there, an example can be; Oshabuilder needed the materials to make a book and quill. I said follow me to celadon. I walked all the way there, and Osha was there too. He couldn't see me, and I couldn't access my chests either.
I have made a fresh .jar and this didn't solve the problem. It as if I step out of my character and not being affected by the surroundings, nothing works for me. No chests, signs, Also, The permissions don't affect me either, such as breaking blocks, but that doesn't matter because the blocks I broke reappear for me when I try to relog.
Does anyone have any suggestions? Because I am stumped. Could it be /gamemode 3? Adventure mode? That is doing this?