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so it seems that having more than one or the same MP3 file being loaded at same time might be the culprit.

you have these options:

1. have brand new build of qtractor from git head (master branch); this problem might (just might) be solved upstream; if you cantake one of the latest snapshots here
2. edit the offending session file (.qtr xml) and remove one (or more) of the possible <clip> section copies that refer to the same mp3 filename; remember to backup, work on a copy and keep the original .qtr file; try pruning <clip>...</clip> sections one step at a time.
3. as suggested earlier on the other topic, convert your mp3's into something else (eg. .flac, .ogg vorbis or even .wav); edit the xml of the session files (.qtr) and replace all occurrences of the old for the new filenames.

hth.
cheers