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i think i remember these as a couple of road blocks i ran into when i upgraded to 2.2.x a while back....
especially with 2.2.x and the compatability issues the new suite brings, it's important to, whenever you put new files on the site, to update your modules, especially the system module. based on those errors, it might be a syncronization error. try updating your modules from the modules administration page.
for the custom blocks, i think there's some weird difference between 2.0.x and 2.2.x that prevents them from being migrated over. i'll try looking into it a bit more, but for now, if it's not too difficult, might as well cut your losses and build them over again. to create a custom block in 2.2.x, go to the blocks page and use the slider at the top of the list to find the listing system > custom block.
for the users being lost, did you try users > find users? if that doesn't work, there's a good chance they can be found under modules > extended profiles > users. it's a little complicated with the new system, but you have to click the "add" hyperlink that's to the right of the slider. it'll find all the users in the system and display them for you to select from.
hope this all helps. good luck with your site!
-zimmi88 =)
"Need coffee, keep away..."