Will not let me take or move items in my inventory

The other day, I was playing on a Minecraft server and when I went to take an item from my inventory, it wouldn't let me click on it. My game then crashed and sadly, I accidentally deleted the crash report D: I got back on and tested it on another server, singleplayer, and both creative and survival, but it still wont let me use my inventory. I need HELP!!! Thank you for your time!