Importing a file larger than 32 megabytes causes this assert:
creating file: compressed.ndx import_file: disk_io.c:1347: find_bit_map_in_cache: Assertion `nwos_block_offset_to_chunks <= block && block < nwos_block_offset_to_chunks + nwos_total_private_blocks' failed.
I don't know the exact file size that causes the failure. A 32 megabyte file seems to work fine. Both a 44 megabyte file and a 130 megabyte file have failed.