My first post [Doomsday problem]

[EEF13]

I downloaded Doomsday and it wont play any of the final doom and on doom 1 aamd 2 it shows the monsters half invisisble

[DaniJ]

You've downloaded 1.9.0-beta5.1 in which all maps which are encoded using a method called sidedef packing, are not supported. Plutonia and TNT are two such map sets that do and hence that version of Doomsday will not play them. I would suggest you download the latest stable version - 1.8.6

The "half invisible monsters" issue is well known and is caused by a bug in ATI's drivers. The only workaround is to disable the effect of dynamic lights on sprites completely (bring down the console and enter "rend-sprite-light 0").