Try setting 'vBa Option' to yes, 'vBa Option - All Forums' to no, and enter the forum ID in the 'vBa Option - Forum IDs' setting. For 'Rebuild Post Cache' go to ACP -> Maintenance -> Update Counters -> Rebuild Post Cache, but you'll only see it if 'Cached Posts Lifespan' is not zero.
Oh, and GIF is forced because it's the admin who rebuilds post cache, via the admin's browser, but not everyone has the same browser as the admin, so to avoid any IE/PNG issues, GIF is forced.
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