Currently I can't use evo for more than about 30 minutes without getting this crash, or a (perhaps related) lock-up in some sql foo, but anyhow - despairing of mail reading, I ran it under valgrind; I append the complete log; some interesting things like this:

==753== Thread 15:
==753== Invalid read of size 4
==753==    at 0x4C3A040: camel_partition_table_lookup (camel-partition-table.c:299)
==753==    by 0x4C423DA: hash_write_word (camel-text-index.c:250)
==753==    by 0x469E112: g_hash_table_foreach (ghash.c:1328)
==753==    by 0x4C4210A: text_index_write_name (camel-text-index.c:724)
==753==    by 0x4C17839: camel_index_write_name (camel-index.c:240)
==753==    by 0x534269B: camel_folder_summary_info_new_from_message (camel-folder-summary.c:2754)
==753==    by 0x5342B15: camel_folder_summary_add_from_message (camel-folder-summary.c:2606)
==753==    by 0xFB34715: local_summary_add (camel-local-summary.c:496)
==753==    by 0xFB392ED: mbox_summary_add (camel-mbox-summary.c:1282)
==753==    by 0xFB34B71: camel_local_summary_add (camel-local-summary.c:327)
==753==    by 0xFB35CFF: mbox_append_message (camel-mbox-folder.c:180)
==753==    by 0x534AF82: camel_folder_append_message (camel-folder.c:1415)
==753==  Address 0x74ff464 is 4 bytes after a block of size 1,048 alloc'd
==753==    at 0x40274A5: calloc (vg_replace_malloc.c:467)
==753==    by 0x46B6379: g_malloc0 (gmem.c:196)
==753==    by 0x4C092CB: camel_block_file_get_block (camel-block-file.c:573)
==753==    by 0x4C3A019: camel_partition_table_lookup (camel-partition-table.c:288)
==753==    by 0x4C423DA: hash_write_word (camel-text-index.c:250)
==753==    by 0x469E112: g_hash_table_foreach (ghash.c:1328)
==753==    by 0x4C4210A: text_index_write_name (camel-text-index.c:724)
==753==    by 0x4C17839: camel_index_write_name (camel-index.c:240)
==753==    by 0x534269B: camel_folder_summary_info_new_from_message (camel-folder-summary.c:2754)
==753==    by 0x5342B15: camel_folder_summary_add_from_message (camel-folder-summary.c:2606)
==753==    by 0xFB34715: local_summary_add (camel-local-summary.c:496)
==753==    by 0xFB392ED: mbox_summary_add (camel-mbox-summary.c:1282)
==753== 

are concerning.