Including a single Event price option for an event with multiple registrant options and ensuring all other registrant options have "Allow anonymous" unmarked still shows the "Register as an unnamed guest" checkbox appear on the form.
Unable to remove anonymous guest checkbox
Download and install the latest patch which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.
Steps to Duplicate
1) Create Event in CRM with more than one Registration Option. Sample database can use Afternoon Tea 2) Create a blank page in BBIS and add in Event Registration part 3) Edit part to include the event from CRM with multiple registrant options 4) Edit the event > Event price options > Mark to include only one Event Registration option 5) Scroll down and expand each Registrant option and ensure all have "Allow anonymous" unmarked 6) Save event and event registration part 7) View page and notice presence of "Register as an unnamed guest" checkbox 8) Edit part and event again, double-check Registrant options and notice "Allow anonymous" is now marked for all other pricing options that are not included