Thanks for the replies, Tim and Rich. I did the resets as you suggested, Rich, and went back and tried some copies. Most worked from documents I have in Dropbox, and interestingly, it seems that some areas of browser text in some sites I could formerly copy no longer seem to copy to the (do you call it a clipboard here?), yet others do. It is not Safari-specific, as I also use Skyfire, Atomic, and a few others as some of those can emulate (to some degree) IE and Firefox. I'm not sure I want to try re-restoring iOS5 from the full backup file, as it took forever the first time and 99.999999% of everything works just fine. Perhaps it is just some sort of issue with the coding in iOS5 that is different from 4 as to how it is interpreting certain types of browser coding... Or the site codings themselves (real HTML vs. generated code from some after-market program).
I'd be interested to hear whether others have similar issues or variants thereof. Thanks again, guys. I see I've come to the right place to find help.