-------------------------------------------------------
-- tracker reloading functions
--------------------------------------------------------
function MQT_ReloadText()
    local qControls = MQT_GetTrackerEntries()
    
    local MyheaderFont = MQT.Defaults.headerFont
    local MyheaderSize = MQT.Defaults.headerSize
    local MyheaderStyle = MQT.Defaults.headerStyle
    local MyheaderColor = {}
    
    if MQT.SV.headerFont ~= nil then
        MyheaderFont = MQT.SV.headerFont
    end
    if MQT.SV.headerSize ~= nil then
        MyheaderSize = MQT.SV.headerSize
    end
    if MQT.SV.headerStyle ~= nil then
        MyheaderStyle = MQT.SV.headerStyle
    end
    if MQT.SV.headerColor ~= nil then
        MyheaderColor.r = MQT.SV.headerColor.r
        MyheaderColor.g = MQT.SV.headerColor.g
        MyheaderColor.b = MQT.SV.headerColor.b
        MyheaderColor.a = MQT.SV.headerColor.a
    else
        MyheaderColor.r = MQT.Defaults.headerColor.r
        MyheaderColor.g = MQT.Defaults.headerColor.g
        MyheaderColor.b = MQT.Defaults.headerColor.b
        MyheaderColor.a = MQT.Defaults.headerColor.a        
    end
 
    local MyqTextFont = MQT.Defaults.qTextFont
    local MyqTextSize = MQT.Defaults.qTextSize
    local MyqTextStyle = MQT.Defaults.qTextStyle
    local MyqTextColor = {}
    
    if MQT.SV.qTextFont ~= nil then
        MyqTextFont = MQT.SV.qTextFont
    end
    if MQT.SV.qTextSize ~= nil then
        MyqTextSize = MQT.SV.qTextSize
    end
    if MQT.SV.qTextStyle ~= nil then
        MyqTextStyle = MQT.SV.qTextStyle
    end
    if MQT.SV.qTextColor ~= nil then
        MyqTextColor.r = MQT.SV.qTextColor.r
        MyqTextColor.g = MQT.SV.qTextColor.g
        MyqTextColor.b = MQT.SV.qTextColor.b
        MyqTextColor.a = MQT.SV.qTextColor.a
    else
        MyqTextColor.r = MQT.Defaults.qTextColor.r
        MyqTextColor.g = MQT.Defaults.qTextColor.g
        MyqTextColor.b = MQT.Defaults.qTextColor.b
        MyqTextColor.a = MQT.Defaults.qTextColor.a      
    end
    
        for i,v in pairs(qControls.headers) do
    
                -- v:SetFont(("%s|%s|%s"):format(LMP:Fetch('font', MQT.SV.headerFont), MQT.SV.headerSize, MQT.SV.headerStyle))
                -- v:SetColor(MQT.SV.headerColor.r, MQT.SV.headerColor.g, MQT.SV.headerColor.b, MQT.SV.headerColor.a)
                v:SetFont(("%s|%s|%s"):format(LMP:Fetch('font', MyheaderFont), MyheaderSize, MyheaderStyle))
                v:SetColor(MyheaderColor.r, MyheaderColor.g, MyheaderColor.b, MyheaderColor.a)
    
        end
    
        for i,v in pairs(qControls.objectives) do
    
                -- v:SetFont(("%s|%s|%s"):format(LMP:Fetch('font', MQT.SV.qTextFont), MQT.SV.qTextSize, MQT.SV.qTextStyle))
                -- v:SetColor(MQT.SV.qTextColor.r, MQT.SV.qTextColor.g, MQT.SV.qTextColor.b, MQT.SV.qTextColor.a)
                v:SetFont(("%s|%s|%s"):format(LMP:Fetch('font', MyqTextFont), MyqTextSize, MyqTextStyle))
                v:SetColor(MyqTextColor.r, MyqTextColor.g, MyqTextColor.b, MyqTextColor.a)
    
        end
    
end

And now - the technical:
The built in lua function, string.find(), is implemented in lstrlib.c by str_find(). This function makes a call to str_find_aux(), which in turn calls the recursive function, match(). Prior to LUA 5.2.2, match() could recurse indefinitely - as long as its process's stack had room. Based on what I could make out from the official LUA source code, the recursive call happens at least once for every character class in a pattern. Therefore, if you have a pattern made completely of character classes, you're setting yourself up for a stack overflow, and thus, a segfault. In LUA 5.2.2, the LUA team added in the following to the first lines of the match function (as well as other bits to get the needed variables declared and set properly):
Code:

if (ms->matchdepth-- == 0)
    luaL_error(ms->L, "pattern too complex");

To anyone who can't decipher that, basically they've set a maximum recursion depth in the match function for LUA 5.2.2. Now, instead of causing the host application to hard crash with a stack overflow, they report a LUA error to the script. Now, this doesn't mean we can use any more complex patterns than we can now, but it does mean that the game won't crash because your pattern was too complex. My theory is that Zenimax is using either LUA 5.2.1 or an in house variant that does not have the above fix. As I said before, I've reported this to Zenimax, and hopefully they update their LUA processing at least with this fix.