Well, I'm at a loss but like cush said, it's probably a framework issue. I went back to the go keyboard and the "I" is capitalizing once again. The only way I can get a number to work on the slide out keyboard is if I hold alt while pressing a number. If you just press and release the alt key and then press a number, only a letter will appear. I hope that helps, I'm out of ideas but you're right, the latinIme. apk didn't help and the latinImeGoogle.apk just forced closed all the time so I removed them. Sorry I couldn't be much more help but believe me, I did try.
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