[Gemma]

Sorry I thought you meant on the highscores list

Open v3ARCADE_Main and find

<vb:if condition="$show['avatar']">
					<div>
						<vb:if condition="!$player['userid']">
							<img class="v3_gameicon" src="{vb:raw player.avatarurl}" alt="" border="0"/>
						<vb:else />
							<a href="{vb:link member, {vb:raw bbuserinfo}}<vb:if condition="$vboptions['friendlyurl'] < 3">&amp;<vb:else />?</vb:if>tab=v3arcade_stats"><img class="v3_gameicon" src="{vb:raw player.avatarurl}" alt="" border="0" /></a>
						</vb:if>
					</div>
				</vb:if>

Replace it with

<vb:if condition="$show['avatar']">
					<div>
						<vb:if condition="!$player['userid']">
							<img class="v3_gameicon" src="{vb:raw player.avatarurl}" height="xxx" alt="" border="0"/>
						<vb:else />
							<a href="{vb:link member, {vb:raw bbuserinfo}}<vb:if condition="$vboptions['friendlyurl'] < 3">&amp;<vb:else />?</vb:if>tab=v3arcade_stats"><img class="v3_gameicon" src="{vb:raw player.avatarurl}" height="xxx" alt="" border="0" /></a>
						</vb:if>
					</div>
				</vb:if>

Changing the xxx (2 instances) to whatever suits your forums