Most of the time - I've seen that the first error is caused by "doubled-up" compression (mod_deflate/mod_gzip along with vBulletin's own one). As mentioned by snakes, disable the one inside vBulletin (mod_deflate is preferred to PHP's method). Another way to do this would be to disable the Apache module first (but you would have to be handy with Apache configs and have access to them).
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