vBShout does not modify your theme in any way so when it's disabled it doesn't leave anything behind that'd do that.
As for the previous issue, that happens if you upgraded from 5.3 or earlier and didn't revert template customisations. Could you please check you don't have any customised vBShout templates?
It can also happen if you have IE7 compatibility header on and is viewing it in IE. Frankly nobody should still be using IE7 anyway so we recommend turning it off, because newer versions of IE are more standards compliant and don't need it, plus they have issues with their Backwards Compatibility rendering engines.
Fillip
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