Lets start with the crashes. Usually when there are crashes when interacting with the Mac file system (like switching companies) the culprit is bad third party software. In particular so called "adware" discussed here:
<a href="
https://support.apple.com/en-us/HT203987" rel="nofollow" target="_blank">
https://support.apple.com/en-us/HT203987</a>
In particular I know Genieo crashes in this way (the instructions to remove it are at the bottom).
