I too was suffering with problems caused by 9.054 that didn't exist prior. Of course my TT740TM Live version came with a 9 series firmware that apparently wasn't being offered anyone -- but it worked fine, essentially. Then 9.054 struck "automatically", probably should have said no to the upgrade until all bugs worked out.
I was near to full reformat of system built in memory, since I have my maps on Micro SDHC card, but instead followed TT instructions for erasing 9.054 system on TT and computer, installing downgrade, AND then I did not take the automatic upgrade to 9.054. Shut down, soft reboot, and start again and then chose to update my system and install 9.054. Now all works well again.
Almost seems like TT needs to drop their automatic download and install and instead offer just the firmware system files for download (zip/rar file) to computer and then have installer program that scrubs the old firmware and installs new, using explorer or self installing program but not home.
One other interesting thing is that my shutdown screen has changed. Not only do I have the euro style No Thief emblem as before, albeit smaller, but now I also have a yellow triangle with warning exclamation point also included in the shutdown screen, prompting me to make sure I remove the TT from my vehicle.
Wonder when they'll decide to have your mother/spouse/nasty boss record a TTS message that screams at you as a final reminder