Boot Up Studio Mode

That shouldn't have anything to do with it locking up in my opinion. The G Manual plainly states that you can choose to have the Fantom G boot up in either Live, Studio, or Single Mode and Roland doesn't mention any problems associated with the G booting up in some other Mode besides the factory default Live Mode that I'm aware of. I haven't read the Manual cover to cover yet so I may be speaking prematurely regarding this though.

But you should be able to boot up the G in any of the three modes if you wanted to and still be able to load samples or whatever on boot up in any of those modes and be okay I would assume. I wonder if anybody else has experienced this lock up on boot up in Studio Mode with their Fantom G?? If so, then it would be more of a confirmation that there is a problem and that people need to load samples (or whatever) in only Live Mode on boot up possibly. But I suspect the problem is not whether the Fantom G is booting up into Studio Mode, but rather, how the Fantom G is setup in the System Menu regarding USB storage settings on boot up, etc., or possibly the thumb drive itself may be the cause.

obvious question- what version of the OS was it running (kinda important to ensure it wasn't one of the initial releases- or a bug in the new version)

it was 1.0. I called roland they told me to install new os 1.1. .I did that.then it. booted/ loaded/ frome 4% to 60% then it stopped at 60%. Roland told me they never heard of that happening. they told me to take my fantom G and replace it where I had bought it frome. So I sent my fantom G back and Im getting another this week.

I let it load for 4 hours. loading at 60%. it never finshed booting.

Now im kinda scared to set my fantom G to load up in studio mode with my sample ive created.

The same thing happened to my G6 version 1.02. I wasn't trying to boot up in studio mode, so that probably has nothing to do with it. I got a 512mb DIMM, but when installed it it didn't help.
I returned it and got another one with some rattling under the hood when I played keys. Returned that one and third times a charm. I wisely purchased a year warranty. No problems and I've since installed version 1.10.

Were you using a USB stick? If it won't boot up, try remove it and use internal memory first.. than Load project from USB memory. Whenever my save/load stuck.. I remove my USB stick and re-plug in and try again. It always work the second time.

No usb. nothing extra pluged in fANTOM G. but power plug.

restatrted over 50 times changed memory. still got stuck loading wave/sample.

I have been having trouble with mine locking up when I save a sample. It doesn't happen all of the time, but every once in a while, when I name and save a sample, it goes to 30 or 40 percent , and an hour later I am still waiting. I power down, redo sampling and it works. Maybe I should return mine as well.