A wee hours .plan update by id Software programmer Robert Duffy has word that of a possible issue with the full Win32 installer for the latest Quake III Arena patch (story). If you are experiencing a problem like the one he describes, take comfort in knowing it's being investigated (and if you're not experiencing a glitch, you probably stopped reading by now anyway). Here's the briefer than my introduction update:

I have seen a few reports of the full Win32 installer not properly installing the latest PAK3 files. Looking into this now, if there is an there is an issue, I'll get more info/fixes up tomorrow ( Saturday ).