I ended up fixing it by just completely resetting photoshop multiple times >< Not sure why it worked one time, but I'm not complaining. And yeah, mine used to do that, now it only really gets pixelly when it's too close. Thank you, though! :3
If your file is high resolution (e.g. 3000 x 2000px) and your brush is the same one you've been using this whole time, there are 2 possibilities I can think of. A. You have accidentally checked one of the Brush options in the Brush Menu panel that needs to be unchecked or adjusted. B. There is something wrong with your performance/video card settings. Try turning off OpenGL support and/or Hardware Acceleration if it is on.
5000px X 5000px - seems a little large, I know. >< My friend told me I should change the default dpi settings from 72 to 300, it seems to work slightly, but to little avail. I made sure I didn't do that with the brush options by resetting them, so nothing is changed with them.
Where would I find OpenGL/Hardware Acceleration? Thank you!
You may have a problem with your video card, because it should be listed in that section where it says Detected Video Card. That would mean it's using on-board video graphics, not your card. Either because you don't have a card or it's not being detected properly (I have dual cards and my CS6 lists both in that section). If you have a video card, find Device Manager on your computer (if you have Vista or W7, type it in the search bar in your Start menu). Locate the video card on the list of devices and see if there's a yellow caution symbol. If there is, something is definitely wrong with detecting the card. Either way, it would be good to check for a driver update for your card. Google your card model for a driver download or check with Windows Updater.
I don't know if this will solve your problem, but it might help.
I'm going to assume it's the connectivity with my video card and photoshop or something. I updated it and everything, and it shows up without the warning symbol. I deleted all settings so it's now exactly how it was when it was initially downloaded, and it didn't work. I'm at a loss, I just don't know what's wrong with it.