When you connect your device to your computer, on your phone, change the settings. Instead of Mass Storage, change it to the other one. There, you should be able to access stuff on the internal storage.
I'll try that whenever my phone decides it's connected :/ Wait no that's only for Windows.
Also I can't change the download location in any browser, and I can't make new folders in File Manager/AndroZip. It's as if the entirety of my phone's storage is nonexistent.
I can still install apps from the Android Market.
Edit: Hmm.. Looking at the storage settings, it says I have no SD card, but it gives me the option to erase AND unmount the SD card. This must have something to do with the ROM I have.