Hi Jack,
When you say it just hangs... is this during initial import of the CSV file into our importer preview ? or after you have loaded it fully into OpenRefine and your trying to use the Edit Cells menu ?
On thing that you might try is to import by LINE based rather than CSV/TSV and then use Split cell into multi-columns by the separator character.
My hunch is that perhaps theirs some encoding issue...so another thing to try is use UTF8 encoding during initial import in OpenRefine, or whatever encoding you think the source dataset is in.
Let us know, we're here to help (Kaggler's especially),
-Thad