SAI pressure sensitivity SOLUTION!!!

[ORIGINAL 2013 SOLUTION] 

2017 UPDATE: I have found new solutions! After purchasing a laptop and installing SAI, unfortunately, I ran across this problem again. If the tips below do not work for you please click this link and check out TWO new ones I have: NEW SOLUTIONS

2016 UPDATE: GUYS. YOU CANNOT GET PEN PRESSURE IF YOU HAVE A MOUSE. I'M SORRY. BUT YOU CAN MANUALLY ADJUST THE THICKNESS OF PARTS OF YOUR STROKES BY USING THE ERASER TOOL OR LINEART TOOL. 

Also, this is not a guaranteed solution and if this doesn't work for you I am so sorry. I am working on an updated solution so please don't fret.

Hey! Two years on I'm gonna make an edit. Paint tool SAI does not require purchase. The trial is good, too. However, if you've found a way to download it for free, I cannot assure you it'll work, hence me emphasising on the SAI MUST BE BOUGHT stuff. lol XD

Sometimes you dig too deep. SAI is sometimes a very complicating and annoying son of an apple, but maybe you're looking too far into it. As suggested some users said, "Unplugging my tablet, restarting my computer and re-plugging my tablet works every time!" just don't forget to save.

If that doesn't work, you truly are in a shazaam and you're probably gonna have to do this stuffs 

NOTE: Reading through the comments today, I've seen testaments that this tutorial is not always the need. CHECK YOUR 'MIN' SIZE. Keep changing it and testing it as you go along. That may be the problem

To everyone I cannot reply to and I've helped, YOU ARE VERY WELCOME! x

Good luck :3


Now, there has been a lot of problems over this I'm gonna tell you what to do with some handy screenshots.
It gets really annoying when you lose pressure sensitivity and you're in the middle of drawing and that is because sometimes SAI can lose your settings, after you have been told to remove all preferences and that, you, like me, may get no response from your pen but only when you press hard on it. I have found a great solution.
This might not work for all users, because of the type of laptop and the type of tablet because it has no sensitivity installed on it at all., but I hope that this will work for you.
Note: Before we go on I forgot to say that you need a tablet, Wacom [preferably] and you also have to have [purchased] SAI.
Without Pressure...:

So, that's what it looks like. yours might be different though, but the next steps will help. Go to Others - Options - DigitizerSupport

Your settings should be at 0%, if it is at 100% then that is why you have to press so hard, if it is other than 0% then set it to that.

Before you fiddle about with SAI, you still mustn't, for smoother lines go to Advanced settings and change your Quality to 4 (smoothest)
Size and Dens ticked. Come out of SAI (if in the middle of project save as a .sai)
Close then re open SAI and feel free to draw!
Any questions ask and I'd love to know that I've helped you ^^

This will also work with trials, there are no more possible ways to download SAI so you must buy it ^_=

Happy 2013