I am also having the same problem.
I tried using plug-ins to find and replace but it won’t work properly if your text has an apostrophe.
For example:
UPDATE wp_posts SET post_content = REPLACE(post_content, ‘[show_to level=”VIP”]’, ‘[s2lf current_user_is(s2member_level1)]’);
If I use this command the command above it gives a different result.
Please help.