id summary reporter owner description type status priority milestone component version severity resolution keywords cc 274 Qt FileDialog locks up machine with Core 2 Quad, but works with Core 2 Duo herwigb "On my !ThinkCentre A57 powered by a Core 2 Quad I noticed immediately after (manual) installation that the machine will lockup solidly when clicking around in the Qt !FileDialog attempting to open a file. This happens for any Qt App I tried, most notably for SMPlayer. If I disable one or more cores of the Quad the lockup is still there. Today I swapped the Core 2 Quad CPU for a Core 2 Duo CPU and the problem completely goes away (that IMHO rules out a faulty installation as Silvan suspected). After going back to the Core 2 Quad, the problem is there again." defect closed major Qt 5 General 4.7.3 medium fixed