Hi Jeremy:
It happens :)
That's right, pulling out the power/USB will do. Always restart MIOS Studio following a power cycle.
Looks like the current one, yep!
Yes, you need to jumper it, means opening up the case unfortunately. Also ensure that resistors R101/R102 are installed.
Hope you can get back to the bootloader! If not, it's typically no biggie to reflash with ST-LINK or JTAG.
Best,
Andy