Hey it's DoctorWhu11.

Recently on some single player worlds and some privately owned servers, I haven't been able to hold an item. I would put it in my hot bar, the scroll over to it, and it would disappear. Please help me. Thanks.

 They are items that can be used only by certain players.

No, it's EVERY item. I can't hold ANY item.

Items including the TARDIS Key, a Sonic Screwdriver, a sponge, cobblestone, and beacons (I've tested: I can't hold ANYTHING) disappear when I put them in my hand.

This means that you gave yourself an item that is player locked such as John's black box and it vanished from your inventory what you need to do is go to gm 1, and hold shift and double click the pink x in your inventory to the right of the hot bar. It will completely clear your inventory. That will solve the issue.

I HAVE REAL PROBLEM!

in ubdate 41, 42, 43, after dematerializing and rematerilising I don't now if I speel them wright but demat lever isn't working.

and I need to kill myself every time I'm stuck in the tardis nowhere... can you help me please?

Make your own thread mate.

Thanks Acediajc!

Is this issue solved?

Yes, yes it is now. You can lock the thread.