Okay, there's a textual error or miscommunication on the site's designer's part. I go to the Rules tab, look up how big I can make my sig image. It says:
Signature Rules
- Must abide by all forum rules.
- Must be 500 x 200 pixels or less.
- Must not have more than either:
- 2 quotes and 1 line of text
- 1 quote and 3 lines of text
- 10 lines of text alone
Now, when I click Edit Signature in the User Control Panel, it read this below the Upload bar and Upload button:
Note: The maximum size of your custom image is
500 by 100 pixels or 9.8 KB (whichever is smaller).
So, I had started designing my signature image according to the Rules, and by the time I was ready to upload it, apparently the Rules have gone out the window and 500x200 no longer applies. No. now its 500x100 according to the stupid Upload Note!
Guys, come on. That wasted like an hour of my time, now I have to redo my sig image. Get the Rules right plz.
EDIT: Ok so it looks to me like the actual problem with the file I was uploading was it was a .bmp, which wasn't even specified in the Rules. Nowhere does it say that you need a .jpg.
So the only thing wrong was the Upload note, which states that the image must be 500x100, not 500x200 like the Rules. That was a typo because my file worked once I changed its filetype.