Was getting an error message when updating a profile in the back end:
administrator/components/com_comprofiler/library/cb/cb.tables.php on line 1308.
Believe it has something to do with authentication of session. Began after upgrade to CB 1.9 on a Joomla 1.7.3 site.
Changes do seem to be saved despite error message. Commenting out line 1308, JAccess::clearStatics();, eliminates error message. Don't see where this creates any security issues, as already authenticated to be in back end. Just passing this along for anyone seeing same issue.