While waiting for a long-running QGIS process to finish I was reminded that macOS 10.9 (“Mavericks”) introduced a feature called App Nap, which suspends or pauses applications that aren’t visible on screen. A few seconds after I switching away from the Spaces virtual desktop that QGIS was running on, macOS would suspend QGIS, preventing the process I was waiting on from ever completing. In earlier versions of macOS there was a checkbox to disable App Nap on a per-application basis in the Get Info window for the app.

Final Update (2022) I have fully migrated away from Billings Pro and am now using Invoice Ninja. Mid-November 2020 Update (Big Sur) After updating to Apple’s newest operating system, Billings Pro 1.7.14 crashes on launch with a segmentation fault. At this point it is abundantly clear that the self-hosted version of this software is on borrowed time, but I found a workaround: Download the latest version of the app (currently 1.

I recently tore down a HP LaserJet CM4540 to fix a different error (59.00.F0) caused by a sticking solenoid. The repair for this is well-documented online, but when I reassembled the printer I got a new error: 99.05.56 Firmware Install Error. I knew this had to have been caused by an error in reassembly since I had done nothing to affect the firmware, and in a few minutes I had found it: a wide, flat ribbon cable on the far right edge of the DC Controller (J105) was left undone.

macOS High Sierra throws another wrench into my preferred remote access software, Timbuktu Pro. A change in the file /System/Library/Frameworks/ScreenSaver.framework/Versions/A/ScreenSaver prevents the Timbuktu Host application from launching. Some solutions online suggest copying an older version of the framework, but this requires disabling System Integrity Protection, could be overwritten with a future system update, and may cause unforeseen problems. I’ve managed to resurrect this software on High Sierra without changing the System Folder or disabling SIP.