The tooltip for grey knowledge boxes sometime reads "-1%" instead of "??%". This seems to affect only the first chapters, and goes away sometime after reloading. Must be somthing weird with this Velocity code from toc.vm: #set($mastery = $entry.Mastery) #if("$mastery" == "-1") #set($mastery = "??")#end #set($tooltip = $i18n.phrase("knowledge.mastery.tooltip", "$mastery")) #masteryImage($entry.Mastery "$tooltip")