First off, jumping back to here: Using the lsof command, it seems like the Quicklook process has some kind of lock on the file. This is the output of the lsof command: Have you tried sampling (with Activity Monitor) the Quicklook process when it's in this state? I'd like to see if it's idled again or if it thinks it's doing something useful. We do need to support Windows clients connected to networks shares since our app is cross-platform. Our team has in fact proved in the past that open(url.path, O_RDWR | O_NONBLOCK | O_EXLOCK) does work over SMB shares and we're reluctant to switch to a totally different locking system. OK. My main warning here is that, in my experience, belief in how well this work is directly proportional to how broad the testing process has been. Given this additional information, do you think there's anything we can do to address the issue? I don't know. The immediate thing I would try here is changing what's your actually doing/returning, both by either using the draw reply o
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App & System Services
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General
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