If you can, please check out the latest source code and test your bug against it, your bug may already be fixed!
Tomboy bugs are tracked using GitHub bug tracker. First of all, search or browse through the already submitted bugs. If you couldn't find a bug report which describes your problem then login or register to the GitHub and then click on the New issue button. Include the Tomboy, Mono runtime, and Linux/Windows distribution version numbers in your bug description as well as expected and observed behavior. Please be verbose and precise.
In the past, Tomboy project used GNOME Bugzilla, specifically the Tomboy module to track bugs. It's still available, but is not actively used any more - GitHub is our primary development platform. We plan to triage and either close or move the existing open bugs from Bugzilla to GitHub tracker.