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could anybody help me
hold down Ctrl and highlight each of the affected items, or just one at a time, right click,
Nvidia 4xx series graphics?
Apparently it may be driver problem which as of yet has not been resolved. Easily solved by going into Launcher options and disabling Hardware Compression, then start Content Manager highlight the affected assets, you can select them all at once using standard Windows methods, hold down Ctrl and highlight each of the affected items, or just one at a time, right click, open for edit, then commit. That should solve the problem.
Leave hardware compression off, it doesn't seem to actually make any difference to performance here.