Thanks for the reply, but it doesn’t work for me.
For me at least, the problem seems to be related to two things.
The search string is in the file name , I.e., ‘Dvořák’ is in the actual file name. It’s not only a field entry.
This problem only happens for me with files that were recently newly imported (i.e., were not already in the Library but were imported first to and tags edited on a different computer - same o/s, same JRiver version) or, in the case of the ‘original title ‘ field not updating, were in the library but were edited on a different computer (same o/s, same JRiver version). In both cases, I expected would be reflected in a Library import to another computer using Library import as usual and as has been my experience in the past.
The search problem doesn’t seem to appear for files imported a while back, there search works fine whether or not there are non English characters.
I've attached a screencap of what a search for Dvorak Piano concerto 33 shows up... "Dvořák" only shows up in "Search Suggestions", not in "Search Results"