Can't Resize Window or use Aero Snap with Explorer

As the title says.

I was messing around with some custom themes (I know, I know, but I'm pretty familiar with the process and I try to take extra precautions) and for what seems like no reason, I cannot resize Explorer (not IE, the actual file explorer) windows and if I attempt to use Aero Snap, absolutely nothing happens--I can maximize, minimize, etc. though. However, if I use any other program, I can resize and I can do snap, so obviously the problem is only with Windows Explorer. I figured I would do a system restore because that has solved any customization problems I've had 99% of the time, but even that doesn't fix my issue.

Another weird issue (besides System Restore not doing anything) is that I even installed another custom theme because I figure that whatever files it gave me would probably fix up the explorer issue--and now the theme is installed but I still can't resize or use snap on Explorer.

Doing a clean install or what have you is NOT an option, so does anyone know what may have been changed and how I can fix it?

Did this new theme have you patch explorer.exe? Or has it patched it itself maybe?

Hey guys, sorry I haven't responded. I ultimately decided to go with the fresh re-install (it wasn't as horrible of a process as I was expecting). However, the problem came back! I haven't installed any custom themes whatsoever. I was doing some text editing and I don't know if it was some weird keyboard shortcut I hit or what, but yet again I cannot re-size the explorer window or use Aero Snap. If I try right-clicking on the explorer title bar, the option to "size" is grayed out. But on every other program I open, everything can be sized and snapped just fine--it's just explorer. I haven't made any modifications to my computer, one second it was fine and the next the problem arises.

Is there some sort of disabling feature that I could have accidentally accessed via a keyboard shortcut? System restore does nothing and I am not going to even consider another re-install.