I've searched a lot and cannot find a similar question for High Sierra. Whats irritating is that I hadn't upgraded to 10.13.4 but it happened on its own one evening. Once my MacBook restarted - the first problem was that passwords and autofill information in Sierra stopped showing up - and all fields were empty (in preferences). I tried to fix that and the only workaround without a full restore was to completely unlink my iCloud account from my MacBook - which isn't ideal or feasible - and viola - my passwords show up in safari (I don't know how). When I login to iCloud again (on my mac-settings), THE PASSWORDS DISAPPEAR AGAIN! Next, I noticed the dock resets to default apps, including those I'd hidden, after every restart. An app that stopped working with a "invalid license file" issue was witopia. I tried a few reinstalls to no avail.
I've done the permission repair fix as advised for earlier versions of sierra. I've also used the HD permissions repair utility. Other than a full restore which will take me back by about 3 months, I'm at my wits end as to why all these issues started and how to fix them. The only point of reference for me is that 10.13.4 install which I didn't even initiate!
In summary: 1. I cannot use iCloud without breaking safari stored passwords and autofill 2. My dock resets every start and its getting annoying 3. Some apps are now broke and can't work (a new install fixed one of these problems but this isn't right) 4. Everything else seems to be working fine: mail, safari, word, excel and powerpoint, some media apps
I'd ideally like to avoid a full restore or reset. I would like to clean up things and that includes fixing my iCloud account/keychain access if it has problems. By the way, my iCloud passwords are fine on my iPhone. I also checked keychain access but don't know how to check/fix any issues (if any) with that.