Description of problem:
On most crashes I see on a F22 machine I get this error message when reporting the crash:
Reporting disabled because the backtrace is unusable
But there are no errors in the log (or event_log file). Just content like this:

--- Running report_uReport ---
('report_uReport' completed successfully)

--- Running analyze_CCpp ---
Ok to upload core dump? (It may contain sensitive data). If your answer is 'No', a stack trace will be generated locally. (It may download a huge amount of data). 'NO'
Analyzing coredump 'coredump'
Alle Debuginfo-Dateien sind vorhanden
Generating backtrace
Backtrace is generated and saved, 17022 bytes
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Version-Release number of selected component (if applicable):
abrt-2.6.1-5.fc22.x86_64
libreport-2.6.2-4.fc22.x86_64
gnome-abrt-1.2.0-4.fc22.x86_64

How reproducible:
Very often on this machine. Maybe 60%…80% of all crashes.

Steps to Reproduce:
1. Wait for crash to happen
2. When gnome-abrt notifies you, open gnome-abrt and press "Report"
3. Wait for report to finish

Actual results:
Reporting works fine until error message is displayed below the "show log" text area stating "Reporting disabled because the backtrace is unusable"

Expected results:
Report should work fine. If not it should tell me why.

Additional info:
If you need a copy of some of my problem directories please provide a PGP key ID (with an email address). I'll not upload all of them here.