Smart render has also been known to cause an issue, so try a render with this feature off. A same format render (all clips are the same format as the intended output) and you have smart render on may be the exception. So, rendering your 21minute vsp will probably take around 30minutes. As a rule of thumb, rendering will take at least as long as the video file composition, and probably longer depending on the file format (eg FHD) and what effects etc you have used. A render will take longer in this mode but any issue will be VS. To isolate the issue to just the VS software, disable all acceleration in the preferences setting. I tracked it to the Intel driver for the display chipset, which apparently has a bug intel will not fix because at 5years it's too old. Example I have a core i3 Intel cpu, using the on-board display adapter, and hardware acceleration simply does not work in 2 video editors, but accel disabled with software only, both render fine. Disable the acceleration is the most direct way of isolating it. It could be the video processor on the main chip (intel), the driver for it, the display adapter if you have one or the drivers for the adapters. Hardware acceleration is a known problem: it works on some systems and not others, generally related to the hardware or relevant drivers.
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