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How video playback works in Opus has not changed in years. If it has started crashing recently, something else probably installed/updated/replaced a video codec/splitter on your system. The FAQs have a guide on fixing video playback: HOW TO: Enable/fix playback of various media formats in Opus - You can also switch to using a different video plugin which may work better and is often easier than tracking down codec issues (Alternative movie playback plugins in the same FAQ).
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Half the speed? Please provide more detail, including timings and the types of files being copied, and the types of drives involved. Also try testing the other way around, doing Explorer first then Opus, in case it is a caching issue. For timing, it is best to look at the disk activity in Task Manager to see when data is really still being written, as Explorer closes its progress dialog before it is really finished.
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Please Ask one question per thread