Submitting bug reports
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How to submit bug reports
Did you find a bug in Sumatra? Please create a bug report in our issue tracker.
Does it involve a specific PDF (or CHM or XPS or ...) file? It's important to provide us with a file that shows the problem by e.g. by attaching it to the issue or uploading it to ge.tt and sharing a link.
If you're using the latest release version, please try the portable prerelease for checking whether the bug has been fixed already for the next version.
If the file (or other information) is confidential, you can e-mail it directly to email@example.com (Krzysztof Kowalczyk).