SOLVED: Cant use signs

[Sourbug]

When i was fighting with Imlerith i noticed that i couldnt use any of the signs. After getting getting back to novigrad i still cant use any signs. Dont know how it happened but it is a big problem. Tried to do a contract but couldnt progress since i cant use aard but i can use axi to while i am riding.

SOLVED: After verifying the game cache from steam and restarting the game i could be able to use signs again.

[Survivalist]

Signs are completely messed up right now. I have the same issue, At first I could not change to any other sign, so I was stuck using Igni. Then after getting on my horse and messing around with the sign wheel, selecting different signs, I got off and I could use all of them except for Axii. Can only use it while on horseback. Just lost 3 hours worth of gameplay because of it.

[Sourbug]

I expected and experienced some bugs throughout the game but this is too much.I hope there will be a patch soon.

[Caz]

Restart the game. My signs got stuck once. I saved, shut the game down, and loaded it back up. Cast the sign once, and then I could change and cast like normal.

[Sourbug]

I did as your say but it didnt work. Now i got constant 0 stamina so i cant run or use signs even if i could. Just wtf is going on.

[r3b0rN]

I cant use my crossbow or throwables.. had to rebind my keys.. sometimes my fast attack wont work. keep dodging, get tired and rage quit.. aaaand restart

[Sourbug]

Well, after a restart and verfying the game cache worked out well for me, so it is solved. I hoped this doesnt happen again.

[Taffle]

I have this issue but i also cant draw my weapons and i have tried varifiring my files. I cant get anywhere with no weapons or signs

[hemouz]

SOLVED for me : There is no need for verifying the game cache for those who can't use the signs to fix this bug you need to throw a bomb called (Dimeritium Bomb) near you Then step away and try to cast any sign ..
BUG NOTE : throwing the Dimeritium bomb near you and saving the game while the bombs still active ... will couse blocking the Magic (Signs) forever when loading ...

[Bartminator]

SOLVED:
Just go fight some wolves. got hit a few times and it worked again.

[SkankyDog]

I have this issue but i also cant draw my weapons and i have tried verifying my files. I cant get anywhere with no weapons or signs. can't leave the room to fight Wolves as I need to cast a spell to break the barrels that are blocking the door.
Can't throw a bomb as the middle mouse button is not working either. "works for all other games"

[EelKat]

I know this is an old thread, but this error just happened to me, and like others the d-bomb fix did not work; so adding this info in case anyone in the future gets this error and like me searches and gets sent to this thread;

Since the D-bomb error mentioned here did not work for me, I spent the last few days going through the codes/scripts to see if I could find the actual error in the game...

The error is in the geralt_stats.xml file

If you know how to edit the game's xml files, you need to go to all of the strings of code for the signs (20 of them, you need to do the skills upgrade versions as well)

for every line that says "stamina_cost" the number after it reads "min 30 max 30"; but it should read "min 3 max 3"; changing all the 30's to 3's fixes the error.

Hope this helps anyone who runs into this in the future and d-bombs don't work for you.

[Maxim]

For those who still face the issue here is what I did to fix it:
1) Enable and open in-game console (add DBGConsoleOn=true to \bin\config\base\general.ini)
2) Enter command learnskill('magic_1')
That command "teaches" Geralt how to use basic Aard mode. For some reason my witcher "forgot" it, and after the command he recovered the ability.