Possible simple fix for Yosemite freeze/high CPU etc

Short version:  Update tom latest version of Dropbox client for OSX
Description:
Running OS X 10.10 on 2011 MBP w/ 840 EVO SSD
Everything was running great for a week or so, then started experiencing high CPU usage, and ultimately the system would stop responding.  Lot's of strange error messages in syslog brought me to the forums, but no answers.
Initially, I thought the trouble was caused by 3rd party kext's loading since I had disabled signing and forcibly enable trim.  In the end, I disabled trim and reset the driver signing to defaults and followed basic troubleshooting posted elsewhere here to regain control:
Boot safe mode
SMC reset
PRAM reset
After this, I enabled trim, etc but ran into trouble yet again.  So I started looking at apps one at a time.  I downloaded and installed the latest Dropbox client, and everything has been great since.  I believe (in my case) the older version of Dropbox that had not been updated since Mavericks seemed to be the culprit.  I wrongly assumed that this couldn't happen due to Sandboxing, but I'm not a software engineer.
Hope this helps.
BKå

Unfortunately, this did NOT work for me. I am still stuck and have done everything. I lost my original user name and now have my long email address as my user ID... bummer. Also, I had a very simple password that I lost, too, because I was trying to reset things. Also, a big bummer!!'
This is day 4 for me now and I am still not able to use my credit card!!!

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