This question may be related to a resolved thread.
I’m also having the issue from the above thread. I updated from 2.1.0 to 2.1.1 and definitely ran the installer. The error when I delete entries is:
Error Number: 1146
Table 'my_database.exp_comment_subscriptions' doesn't exist
DELETE FROM exp_comment_subscriptions WHERE `entry_id` = '5'
Filename: libraries/api/Api_channel_entries.php
Line Number: 540