I've been searching online for this and haven't found anything but smart remarks.

I went down to Blackreach, and everything was fine. Until I had to jump over some rubble and couldn't.
I can jump and THEN push forward, but I cannot run forward and hit jump, it just continues to move forward.
And I don't mean sprinting and jumping. I have always run on, so I'm talking about just pushing forward and hitting jump.

I've tried closing Skyrim, and re-loading. I've tried going back to previous saves, even before Blackreach.
I have made sure I'm not over-encumbered. (I even made carry weight 20k)
I have switched weapons, tried crouching, un crouching.
I uninstalled any recent mods (non of which would have had any effect on controls or keys, im talking textures)

I have also re-binded my keys in the Controls menu inside Skyrim.

Also, I CAN walk backwards and jump. But I can't move sidesways and jump, nor move forwards and jump.

This just started happening and I don't know what is doing it...?

Oh, and I do use a wireless keyboard, so I tried replacing the batteries, re syncing it, and hitting all the keys up top.

Im an archer and I move around alot in my play-style, and not being able to run and jump whenever I want to is REALLY annoying.

What is going on and does anyone have an idea how to fix this?

Thanks

I haven't experienced this bug although I did experience a bug where my favourites and crafting buttons disappeared (as in pressing favourite button wouldn't open the menu, and in crafting the option to Craft didn't appear)

Deleted the custom_keybind file didn't work. So instead I uninstalled the game, reinstalled it and it went back to working.

That's all I can suggest I'm afraid.

EDIT: Typo

Try reloading an older save game. Sometimes a bug gets wrapped up with your save, and stuck there. It's like bringing fruit from another country. Stowaway bug.

For instance, I've been unable to sprint a couple of times, and had infinite magicka a couple of times, and had health that didn't regen a couple of times. Luckily, I learned early-on to save frequently, so not too much progress was lost.