don't if it is a real problem but though you should know,
i updated from 1.8.0 and have migrated the db step by step to 1.8.6.
when i do a check on the table mysql report the following problem
Code:
Problems with indexes of table `phpdig_excludes`
PRIMARY and INDEX keys should not both be set for column `ex_id`
Problems with indexes of table `phpdig_includes`
PRIMARY and INDEX keys should not both be set for column `in_id`
Problems with indexes of table `phpdig_keywords`
PRIMARY and INDEX keys should not both be set for column `key_id`
Problems with indexes of table `phpdig_logs`
PRIMARY and INDEX keys should not both be set for column `l_id`
Problems with indexes of table `phpdig_sites`
PRIMARY and INDEX keys should not both be set for column `site_id`
Problems with indexes of table `phpdig_spider`
PRIMARY and INDEX keys should not both be set for column `spider_id`
Problems with indexes of table `phpdig_tempspider`
PRIMARY and INDEX keys should not both be set for column `id`
though you should know...