Is there any chance that you had the two screens configured with one logically above the other rather than side-by-side ?
If one screen was above the other then your total area would be something like 1280 x 1568, which would fit in a 2k x 2k texture limit, vs 2304 x 800 which does not.
If one screen was above the other then your total area would be something like 1280 x 1568, which would fit in a 2k x 2k texture limit, vs 2304 x 800 which does not.
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