How to resolve AdBlock issue? 
Can you update the Mac Pro to 10.4.10? It's clumsy in FCP to move between non-compatible versions, You can export an XML of your project in 4.10 and open that in the older version. No problem going the other way, You share a transport library and open the older project in the new version. The real problem comes up if you use features in 10.4.10 that aren't in 10.4.6 or if you use plugins that don't share between versions. It's best, if you can, to keep the systems on the same version.
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There is no trial version available for High Sierra. The hardware is not upgradable beyond 10.13.6.
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The shaded area is a single frame of video. You’re Zimmer too far into the timeline. Video can only be cut at frame boundaries, not in the middle of the frame. Audio can be cut more precisely.
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This thread is based on older versions of the application. The current version does not behaved as described here. What version are you using? Please exactly describe what the problem you're seeing is, what you expect to happen, and what is actually happening.
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Thanks again. Presumably Apple acknowledges the problem of the lost render files, which has never been dealt with.
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HEVC is the codec. There should a checkbox for transparency. Compressor does this easily. FCP can do it as well, but it’s a nuisance building the image sequence.
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Select the clip i and use the Open Clip function. Inside the clip container, select the audio and use Break Apart. You can shift the channels there.
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Just move the application to the trash and redownload it from the App Store. The plugins are not part of the application, or should not be. I’ve heard of one developer who instructs users to open the application bundle and install the plugins there. You shouldn’t do that and shouldn’t use plugins that do.
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The duration of a still in the timeline? Select it. Press Control-D and type the duration you want.
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