The alerts tab shows alerts generated by Burp's tools. This information may be useful to troubleshoot network connection or other problems.
If the same alert is generated more than once in succession, the alerts are consolidated into a single entry in the table, with a counter showing the number of times the alert was generated.
Get help from other users, at the Burp Suite User Forum:
This release contains various new features and enhancements.
The Scanner has been updated with the ability to detect cross-site request forgery vulnerabilities. The Scanner logic for the detection of XSS and SQL injection vulnerabilities has been further enhanced. Burp's use of temporary files has been updated to use a small number of large temporary files, rather than an individual file for each saved HTTP request and response.