IMHO the vb3 is just much much more stable than vb4, period.
The customizations is also the king. For forums with just a few modification like installed popular addons or just a custom theme it's not a problem to upgrade. But when a forum is heavily modified and there is plenty of custom code implemented in original vb files too, rewritten functions, custom written mods etc the upgrading would be a huge challenge.
And tell me what vb4 has that vb3 doesn't or cannot have with mods on?
Subject of vb3 vs vb4 has been discussed hundreds of times anyway just google it.
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